FET Due Date Calculator

For frozen embryo transfers, we know the exact conception date. We subtract the embryo age (3, 5, or 6 days) from transfer date to get conception, then subtract 14 more days to get your "last menstrual period" (LMP). Your due date is 280 days from that LMP date.

Yes, FET due date calculations are highly accurate because we know the exact conception date. Unlike natural pregnancy where ovulation is estimated, with FET we know precisely when the embryo was created. However, actual delivery can vary by ±2 weeks from the due date.

Yes, Day 5 embryo transfers result in a due date 2 days earlier than Day 3 transfers because the embryo is already 5 days old at transfer (vs 3 days old). This means your pregnancy is technically "further along" with a Day 5 transfer.

Most clinics continue progesterone supplementation until 10-12 weeks of pregnancy, when the placenta takes over progesterone production. Never stop medications without your doctor's approval, as stopping too early can risk pregnancy loss.