When did I conceive if my due date is may 12

You ovulate 14 days after the first day of your period. My due date is may 17th. The first date of my last period was August 8th. The baby was conceived on August 21st. Which was 14 days after my last period. However, the sperm stays in you 24 hours. So the baby could have been conceived the day after you ovulated.

Oh... just realized our babies are going to be born around the same time. Cool :)

Is your due date base on your last period or ultrasound?

If your due date is May 12, you conceived on or around August 21.