Period started on the 6th... ended the 10th... had intercourse on the 11-12th with an oppsie didn't pullout fully in time. moderate to severe cramping?

Crazy Guideline: If you have quite regular cycles, ovulation could have occurred around the 20th. The egg lasts 24 hours and sperm is only viable for 3-5 days. Therefore conception would be unlikely after the 17th. However be advised that these dates presuppose a very regular cycle of 28 days and are merely estimates. If you miss your period,get a pregnancy test or discuss this with your gynecologist.