Wondering how many days after your period you can get pregnant? Use the calendar below to see your fertile window by day based on your cycle length and period dates. Related calculators Conception chance over several months Convert cycle-level planning into a per-month and cumulative multi-month conception estimate.→ Chance after unprotected intercourse Estimate the chance … Read more
Key points Conception means fertilisation near ovulation, not the day you had intercourse. The fertile window usually spans about six days and ends on ovulation day. Sperm can survive in the reproductive tract for up to about five days in the right cervical mucus, so intercourse before ovulation can still lead to conception later. Implantation … Read more
Select a vessel and GA to see typical PI/RI/PSV ranges and whether your value is below, within, or above the band. Vessel Umbilical artery Middle cerebral artery Choose the vessel, then pick a Doppler measure below. Measure Pulsatility index (PI)Resistance index (RI)Peak systolic velocity (PSV) Gestational age — weeks Days (0–6) Your value (unit depends … Read more
Enter two values (EFW g, AC mm, or FL mm) to see the percent size difference between twins and a plain-language band. Measurement type EFW (g) AC (mm) FL (mm) Discordance uses the same formula for all three: (larger − smaller) ÷ larger. Twin A Twin B Calculate Clear Copy summary Discordance — — — … Read more
Enter GA, LMP, or EDD to see personalized date windows for NT, NIPT, the anatomy scan, gestational diabetes screening, and Tdap. Reference date (today or visit date) We calculate your schedule relative to this date. How do you want to enter progress? By GA (w+d) By LMP date By EDD date Weeks Days (0–6) LMP … Read more
Use your ultrasound’s estimated fetal weight (EFW) and gestational age to see the percentile and a typical range based on a Hadlock-style reference. Gestational age (weeks + days) Typical use: 18–40 weeks. We clamp to 14–42 if outside. Estimated fetal weight (EFW) in grams From your ultrasound report. Lookup percentile — — — Percentile is … Read more
Use a single femur length (FL) measurement to estimate gestational age (weeks+days) and see where that length sits by percentile for this stage. Femur length (FL) in mm Enter the measured femur length from ultrasound. Known GA (optional) If provided, we compute percentile at this GA. If left empty, we estimate GA from FL. Calculate … Read more
Enter a biparietal diameter (BPD) in millimetres. The tool estimates gestational age, shows the percentile, and lists a typical BPD range for that age. Biparietal diameter (BPD) in millimeters Standard transthalamic plane (thalamus visible, cavum septi pellucidi, calipers outer-to-inner). Calculate Clinician tools Estimated GA: — — weeks Percentile for BPD at this GA: — Typical … Read more
Enter weeks+days or DPO to see a typical hCG band for that stage. Add your result to compare against the band. How do you want to enter progress? By weeks + days By DPO (ovulation) GA = gestational age from last period. DPO = days past ovulation (we add 14 days to map to GA). … Read more
Enter two quantitative hCG blood-test results and their collection times. See the change between the tests, the equivalent 48-hour change, and an estimated doubling or halving time. First blood test Draw 1 date and time Use the collection time shown by your lab. Draw 1 hCG Enter the quantitative serum result in mIU/mL or IU/L. … Read more