Implantation bleeding. “Implantation bleeding is thought to be light bleeding that occurs about 10 days after ovulation,” says Washington, D.C.-based ob-gyn Dr. Cordelia Nwankwo.

If you have them, you'll feel implantation cramps in your lower abdomen, in the middle rather than on one side. (It's your uterus that's cramping, even if the implantation is happening in one area.) ...

This process can take 6 to 12 days. If your body follows a 28-day menstrual cycle, implantation may happen between days 20 to 26. Light spotting that stops around day 28 could be a sign of ...

Implantation bleeding happens around 10-14 days after fertilization, says Dr. Makarov. But fertilization isn't instantaneous — meaning it doesn't always happen immediately during or after sex.

An implantation dip refers to a decrease in basal body temperature of a few tenths of a degree — for example from 97.9 to 97.6°F (36.6°C to 36.4°C) — for a period of one day.