How many days after menstruation does pregnancy occur?

Pregnancy is most likely to occur about 10–16 days after menstruation. This is generally the time of ovulation.

Briefly, the menstrual cycle can be explained as follows:

1. The day a period starts is considered the first day of the menstrual cycle.
2. In most women, ovulation occurs between days 12 and 16.
3. Pregnancy occurs if the egg is fertilized within 24 hours of ovulation.
4. There is a total fertile window of about 5–6 days before and after ovulation when pregnancy is possible.
5. So the chance of pregnancy is highest around the second week after menstruation.