Early pregnancy

After a positive test. Dating, hCG interpretation, and what to expect when.

Example answer44.8 hours to doubleFrom two tests, 48 hours apartIs my hCG rising normally?You need: First hCG result, Second hCG result, Hours between the testsOpen calculator →
Example answer261 days to your due dateDay-5 transfer, 4 days agoWhen is my baby due?You need: Embryo age at transfer, Days since transferOpen calculator →
Example answer8 wk 4 d pregnantFirst trimesterHow many weeks pregnant am I?You need: Days since your last period startedOpen calculator →
Example answer11–14 wk next: dating scanYou are 8 weeks todayWhen are my scans?You need: How many weeks pregnantOpen calculator →

The early weeks after a positive test

Two things dominate this period: hCG and dating. hCG is useful early and stops being useful above roughly 6,000, when ultrasound answers the question better. Dating after IVF is unusually precise, because conception is a known date rather than an estimate.

One caution that applies to every hCG calculator including ours. Around 21% of ectopic pregnancies rise like a healthy intrauterine pregnancy and about 8% fall like a miscarriage. No number rules ectopic in or out — only ultrasound establishes location.