Implantation Calculator

Between 6 and 12 days after ovulation. In a large study of natural pregnancies (Wilcox, 1999), most embryos implanted 8 to 10 days after ovulation, so about 22 to 24 days after the first day of the last period in a 28-day cycle.

Light pink or brown spotting that some people notice around the time of implantation, roughly 10 to 14 days after conception. It is lighter and shorter than a period, usually a day or two, and many people never have it. Heavy bleeding or bleeding with pain should be checked by a doctor.

The pregnancy hormone hCG is made once the embryo implants and takes a few days to reach a level a home test can detect. A sensitive test may show a faint line from about 11 days past ovulation, but a test on the day your period is due is far more reliable.

A day 5 blastocyst usually starts to implant 1 to 3 days after transfer, and a day 3 embryo a few days later, as it first has to grow into a blastocyst. Clinics usually book the blood test (beta hCG) 9 to 11 days after a day 5 transfer. Frozen embryo transfers follow the same timing.

Many people feel nothing. Some notice light spotting, mild cramps, tender breasts, or a dip in basal body temperature, but these are also common before a period, so only a pregnancy test can tell you.

Days past ovulation. 1 DPO is the day after ovulation. People trying to conceive count DPO because implantation and test timing follow ovulation, not the cycle day.