I had unprotected sex ( he did not ej) on Feb 25. my cycle day 7. I have a usual 30 day cycle and ovulated on March 5th according to my chart. It is 3 days before my period and I had some bleeding to fill up the pad and then it turned brown and then stopped. Should I wait to see if I missed my period ? By the way.. today is Mrch 16 and my cramps are horrbiel.