<pclass="lede">Log the first day of your last period and your typical cycle length — the calendar plots your period, fertile window, and ovulation day automatically, and updates every time you adjust the numbers.</p>
<pclass="lede">Conception is only possible in the days leading up to and including ovulation. This view uses the same cycle dates to surface your fertile window, plus what basal body temperature and cervical mucus typically do each day around it.</p>
<pclass="lede">Enter the first day of your last menstrual period (LMP) — pregnancy is dated from there, not from conception. The tracker converts today's date into a gestational week and your estimated due date.</p>
<divclass="controls">
<divclass="field">
<labelfor="pr-lmp">Last menstrual period</label>
<inputtype="date"id="pr-lmp">
</div>
</div>
<pclass="example-note"id="pr-example-note">Prefilled with an example LMP — enter your own for your real week and due date.</p>
<divclass="stat-row"id="pregnancy-stats"></div>
</div>
<divclass="hero-art">
<svgviewBox="0 0 200 200"aria-hidden="true">
<pathd="M20 160 C 60 150, 60 60, 100 40 C 140 20, 160 60, 180 30"fill="none"stroke="var(--pregnancy-soft)"stroke-width="10"stroke-linecap="round"/>
<pathid="pregnancy-progress-path"d="M20 160 C 60 150, 60 60, 100 40 C 140 20, 160 60, 180 30"fill="none"stroke="var(--pregnancy)"stroke-width="10"stroke-linecap="round"stroke-dasharray="230"stroke-dashoffset="230"/>
CycleWise AU gives general educational estimates based on average cycle math — not medical advice or a diagnosis. Actual timing varies by body. Speak with a clinician for guidance specific to you. Dates you enter are stored only in this browser, on this device.
window:"Ovulation through the day before your next period",
desc:"The ruptured follicle becomes the corpus luteum and secretes progesterone to prepare the uterine lining. If no implantation occurs, hormone levels fall and the cycle restarts.",
hormone:"Progesterone: rises then falls",energy:"Energy: gradually declining",
symptoms:"Bloating, breast tenderness, irritability, food cravings (PMS)",
tip:"Basal body temperature stays elevated ~0.3–0.5°C through this phase — a useful way to confirm ovulation already happened."
}
};
// offset relative to ovulation day (0 = ovulation)
varOVULATION_DAYS={
"-5":{fert:"Low",fertClass:"fert-low",bbt:"Baseline (pre-shift)",mucus:"Dry to sticky",note:"Sperm can survive up to 5 days, so conception is technically possible starting here."},
"-4":{fert:"Low–moderate",fertClass:"fert-low",bbt:"Baseline",mucus:"Sticky, cloudy",note:"Fertility begins climbing as estrogen rises toward its pre-ovulation peak."},
"-3":{fert:"Moderate",fertClass:"fert-mid",bbt:"Baseline",mucus:"Creamy, increasing in volume",note:"Cervical mucus is becoming more hospitable to sperm."},
"-2":{fert:"High",fertClass:"fert-high",bbt:"Baseline",mucus:"Thin, stretchy, egg-white-like",note:"One of the two most fertile days of the entire cycle."},
"-1":{fert:"Peak",fertClass:"fert-peak",bbt:"Baseline (often the day of the LH surge)",mucus:"Clear, slippery, maximum stretch",note:"Statistically the single highest-probability day for conception."},
"0":{fert:"Peak",fertClass:"fert-peak",bbt:"Still baseline — the rise hasn't happened yet",mucus:"Egg-white, abundant",note:"The egg is released and is viable for roughly 12–24 hours. Some feel a one-sided twinge (mittelschmerz)."},
"1":{fert:"Dropping fast",fertClass:"fert-mid",bbt:"Beginning to rise ~0.3–0.5°C",mucus:"Becoming tacky again",note:"The egg's fertile window is closing; BBT starts its post-ovulation climb."},
"2":{fert:"Very low",fertClass:"fert-low",bbt:"Elevated, holding",mucus:"Dry or minimal",note:"Progesterone from the corpus luteum keeps temperature elevated through the luteal phase."},
"3":{fert:"Essentially none",fertClass:"fert-low",bbt:"Elevated, holding",mucus:"Dry",note:"If fertilization happened, the embryo is traveling toward the uterus."},
"4":{fert:"Essentially none",fertClass:"fert-low",bbt:"Elevated, holding",mucus:"Dry",note:"Too late in the cycle for a new ovulation; luteal phase symptoms may start appearing."},
"5":{fert:"Essentially none",fertClass:"fert-low",bbt:"Elevated, holding",mucus:"Dry",note:"Implantation, if it happens this cycle, typically occurs around days 6–10 after ovulation."}
{c:"a poppy seed (not yet fertilized)",m:"n/a",dev:"Pregnancy is dated from the first day of this period, before conception happens — your body is shedding last cycle's lining and preparing a fresh egg.",body:"This week looks and feels like an ordinary period.",tip:"If you're trying to conceive, this is a good week to start a prenatal vitamin with folic acid."},
{c:"an egg cell",m:"~0.1 mm",dev:"Rising estrogen prompts an egg to mature; ovulation typically occurs near the end of this week, roughly two weeks before a missed period.",body:"Cervical mucus becomes clear and stretchy around ovulation — a natural fertility sign.",tip:"This is the fertile window if you're trying to conceive — see the Ovulation tab for day-by-day detail."},
{c:"a grain of sand",m:"~0.1–0.2 mm",dev:"If sperm meets egg this week, fertilization occurs in the fallopian tube and the resulting cell begins dividing as it travels toward the uterus.",body:"No symptoms are detectable yet — even a sensitive test won't turn positive for another week or two.",tip:"Implantation, if it happens, usually occurs 6–10 days after ovulation."},
{c:"a poppy seed",m:"~0.1 mm",dev:"The fertilized egg implants in the uterine lining and begins producing hCG, the hormone home pregnancy tests detect.",body:"Most people notice no symptoms yet; a sensitive test may already turn positive near the end of this week.",tip:"A missed period is usually the first sign — testing a few days after that gives the most reliable result."},
{c:"a sesame seed",m:"~2 mm",dev:"The neural tube — the earliest structure of the brain and spinal cord — begins to form, along with the first blood vessels.",body:"A missed period is usually the first clear sign; fatigue and tender breasts may begin.",tip:"Avoid alcohol and confirm any medications with a clinician — this window is critical for early development."},
{c:"a lentil",m:"~4 mm",dev:"A primitive heart tube starts beating, and the beginnings of the face, arms, and legs appear as small buds.",body:"Morning sickness and smell sensitivity often begin here, though timing varies widely.",tip:"Small, frequent, bland meals tend to sit better than three large ones if nausea has started."},
{c:"a blueberry",m:"~1.3 cm",dev:"The brain is dividing into distinct sections, and the arm and leg buds are elongating into recognizable limbs.",body:"Bloating and mild cramping are common as the uterus makes room to grow.",tip:"This is when most people schedule their first prenatal appointment — dating scans are most accurate now."},
{c:"a raspberry",m:"~1.6 cm",dev:"Fingers and toes are forming, still webbed; the heart now has four distinct chambers.",body:"Fatigue often peaks around this point as progesterone rises sharply.",tip:"Rest when you can — first-trimester exhaustion is real and temporary, not a sign anything is wrong."},
{c:"a grape",m:"~2.3 cm · 4 g",dev:"The embryo is officially called a fetus starting around now; essential organs are all present in early form and the tail has disappeared.",body:"Nausea, food aversions, and a heightened sense of smell are often at their strongest.",tip:"Ginger tea, vitamin B6, and staying hydrated are commonly recommended first-line options for nausea."},
{c:"a kumquat",m:"~3 cm · 7 g",dev:"Vital organs — kidneys, liver, brain — are functioning in a basic form, and tiny fingernail beds are forming.",body:"A visible baby bump is still unlikely, though clothes may feel tighter.",tip:"Ask your provider about first-trimester screening options available in this window."},
{c:"a fig",m:"~4.1 cm · 10 g",dev:"The fetus can now bend its arms and legs, and tooth buds are forming beneath the gums.",body:"Round ligament twinges may start as the uterus stretches.",tip:"Gentle stretching and changing positions slowly can ease early ligament discomfort."},
{c:"a lime",m:"~5.4 cm · 14 g",dev:"Reflexes are developing — fingers can curl, and toes can wiggle, though it can't be felt yet.",body:"The end of the first trimester is near, and miscarriage risk drops meaningfully from here.",tip:"Many people choose to share their pregnancy news around now, though the choice is entirely personal."},
{c:"a plum",m:"~6.7 cm · 23 g",dev:"Vocal cords are forming, and unique fingerprints are being etched onto tiny fingertips.",body:"Some early nausea may start easing as the placenta takes over hormone production.",tip:"The nuchal translucency scan, if chosen, is typically done between now and week 13."},
{c:"a passion fruit",m:"~10 cm · 45 g",dev:"Baby can open and close fists and may even suck a thumb; genitals are differentiating, though not yet visible on ultrasound.",body:"For many, first-trimester nausea and fatigue begin to lift.",tip:"Second-trimester energy often supports resuming or starting light-to-moderate exercise — check in with your provider first."},
{c:"a peach",m:"~11.6 cm · 58 g",dev:"Vocal cords are complete and the intestines, which developed in the umbilical cord, move into the abdomen.",body:"Welcome to the second trimester — often called the most comfortable stretch of pregnancy.",tip:"An anatomy scan is usually scheduled in the coming weeks; ask your clinic when it's booked."},
{c:"a lemon",m:"~13 cm · 70 g",dev:"Fine, downy hair called lanugo begins covering the body, and the kidneys are producing urine into the amniotic fluid.",body:"A small bump may finally become visible; appetite often improves noticeably.",tip:"Iron needs rise sharply now — leafy greens, legumes, and lean meat help meet increased demand."},
{c:"an apple",m:"~14.2 cm · 95 g",dev:"The skeleton continues hardening and baby can sense light through closed eyelids.",body:"Skin changes like a faint linea nigra or darkened areolas may appear as pigment increases.",tip:"Daily SPF helps limit pregnancy-related skin pigmentation (melasma) from sun exposure."},
{c:"an avocado",m:"~16 cm · 135 g",dev:"The placenta is now fully formed and functioning as baby's life-support system.",body:"First flutters of movement ('quickening') may be felt any time from now through week 20.",tip:"Movement timing varies a lot — first pregnancies and anterior placentas often mean feeling it later."},
{c:"a pomegranate",m:"~17.7 cm · 160 g",dev:"The skeleton is converting from cartilage to true bone, and fat stores are just beginning to accumulate.",body:"The uterus is now roughly at the level of the belly button.",tip:"A pregnancy support pillow can meaningfully improve sleep as side-sleeping becomes more comfortable."},
{c:"a bell pepper",m:"~19 cm · 190 g",dev:"Ears have reached their final position and baby may begin startling at loud external sounds.",body:"Quickening is commonly felt by now — often described as bubbles or light taps.",tip:"Try narrating your day out loud — hearing is developing and familiar voices become recognizable over time."},
{c:"a mango",m:"~20.3 cm · 240 g",dev:"A waxy coating called vernix caseosa begins protecting the skin, and taste buds are forming.",body:"Backaches can start as posture shifts to balance the growing bump.",tip:"A supportive, flatter shoe and a pillow between the knees at night both help low back strain."},
{c:"a banana",m:"~25.6 cm · 300 g",dev:"The detailed anatomy ultrasound is often done around now if it hasn't happened already, and sex can typically be identified on it.",body:"Movements are stronger and more frequent; the uterus is now level with the belly button.",tip:"If you want to know the sex and haven't had the anatomy scan yet, ask your clinic to schedule it soon — it's usually done weeks 18–22."},
{c:"a carrot",m:"~27 cm · 360 g",dev:"Baby is swallowing small amounts of amniotic fluid, giving the digestive system practice.",body:"Stretch marks may start appearing on the belly, hips, or chest as skin stretches.",tip:"Moisturizing won't prevent stretch marks, but it can ease the itchiness that comes with stretching skin."},
{c:"a papaya",m:"~28.9 cm · 430 g",dev:"Eyebrows and eyelids are fully formed, and the sense of touch is developing rapidly.",body:"Braxton Hicks — brief, painless practice contractions — may be felt occasionally from here on.",tip:"Braxton Hicks usually ease with a change of position or a glass of water; true labor contractions don't."},
{c:"an ear of corn",m:"~32.2 cm · 600 g",dev:"The lungs begin producing surfactant, a substance essential for breathing air after birth — a key viability milestone.",body:"The linea nigra (a dark vertical line on the belly) may become more visible.",tip:"This week is often cited as the threshold of viability with intensive neonatal care, should birth happen very early."},
{c:"a cauliflower head",m:"~33.7 cm · 660 g",dev:"Baby can now respond to your voice, and hand grip strength is developing.",body:"The glucose screening test for gestational diabetes is typically scheduled around now.",tip:"If asked to fast beforehand, follow your clinic's instructions closely for an accurate glucose result."},
{c:"a head of lettuce",m:"~35.6 cm · 760 g",dev:"Eyes begin to open after being fused shut since early development, and hair may be visibly growing.",body:"Round ligament pain and rib discomfort can increase as space gets tighter.",tip:"A maternity support band can ease rib and ligament pressure during long periods of standing or walking."},
{c:"a bunch of scallions",m:"~36.6 cm · 875 g",dev:"Brain tissue is developing rapidly, and baby is developing regular hiccups you may be able to feel.",body:"Third trimester begins soon — appointments typically become more frequent from here.",tip:"Hiccup-like twitches are completely normal and are the diaphragm practicing its rhythm."},
{c:"an eggplant",m:"~37.6 cm · 1.1 kg",dev:"Eyes can blink now, and baby may cycle through active REM sleep.",body:"Welcome to the third trimester — the home stretch begins.",tip:"This is a common time to start planning a hospital bag and reviewing birth preferences."},
{c:"a butternut squash",m:"~38.6 cm · 1.2 kg",dev:"Bones are fully formed but still soft and flexible, ready to move through the birth canal.",body:"Frequent urination often returns as the head engages lower in the pelvis.",tip:"Kick counts become a useful daily check-in — note baby's typical pattern of movement."},
{c:"a large cabbage",m:"~39.9 cm · 1.3 kg",dev:"The brain is developing at its fastest rate yet, adding folds and surface area.",body:"Sleep can become harder to find as the bump limits comfortable positions.",tip:"A full-body pregnancy pillow supports the belly, back, and knees simultaneously."},
{c:"a coconut",m:"~41.1 cm · 1.5 kg",dev:"All five senses are now functioning, and baby is gaining roughly half a pound a week.",body:"Colostrum, the first form of breast milk, may begin to leak slightly.",tip:"A few nursing pads in your bag can help if colostrum leaking becomes noticeable."},
{c:"a jicama",m:"~42.4 cm · 1.7 kg",dev:"Baby is practicing breathing movements against a closed airway, strengthening the lungs.",body:"Swelling and mild carpal tunnel tingling in the hands can appear from fluid retention.",tip:"Report sudden or severe swelling to your provider promptly — it can occasionally signal preeclampsia."},
{c:"a pineapple",m:"~43.7 cm · 1.9 kg",dev:"Bones are hardening overall, though the skull stays deliberately soft and flexible for delivery.",body:"Pelvic pressure increases as baby continues descending.",tip:"Prenatal massage or a warm bath can ease the deep pelvic ache many feel this week."},
{c:"a cantaloupe",m:"~45 cm · 2.1 kg",dev:"The central nervous system is maturing quickly, and baby's grip is now quite strong.",body:"Braxton Hicks contractions often become more noticeable and frequent.",tip:"Time any contractions that feel different — regular, intensifying, closer together warrants a call to your provider."},
{c:"a honeydew melon",m:"~46.2 cm · 2.4 kg",dev:"The kidneys are fully developed, and the liver is processing waste products on its own.",body:"You may feel baby 'drop' lower as it settles into position for birth.",tip:"Lightening (the baby dropping) can ease heartburn but often increases bathroom trips."},
{c:"a head of romaine",m:"~47.4 cm · 2.6 kg",dev:"Most physical development is complete; the focus now is steady weight gain.",body:"You've just reached 'early term' — babies born from here on tend to do very well.",tip:"Pack your hospital bag if you haven't yet — early-term babies can arrive with little warning."},
{c:"a leek",m:"~49.8 cm · 3.1 kg",dev:"Baby continues laying down fat for temperature regulation after birth, and the brain is still rapidly developing.",body:"Nesting instinct and a burst of energy are common right before labor.",tip:"Balance nesting energy with rest — labor's timing is unpredictable."},
{c:"a mini watermelon",m:"~50.7 cm · 3.3 kg",dev:"Full term. The lungs are completing final maturation in preparation for that first breath.",body:"Increased pelvic pressure and more frequent, intense Braxton Hicks are common.",tip:"Watch for your labor signs: regular contractions, water breaking, or a bloody show."},
{c:"a small pumpkin",m:"~51.2 cm · 3.5 kg",dev:"Baby is fully developed and simply continuing to grow, ready to meet you.",body:"If labor hasn't started, your provider will discuss monitoring or induction options.",tip:"Most babies arrive within two weeks of their due date in either direction — both are entirely normal."}
varlabel=ovSelectedOffset===0?"Ovulation day":(ovSelectedOffset>0?ovSelectedOffset+" day"+(ovSelectedOffset>1?"s":"")+" after ovulation":Math.abs(ovSelectedOffset)+" day"+(ovSelectedOffset<-1?"s":"")+" before ovulation");
