I have been on the birth control pill for over 5 month.My pack finished.i was off the pill for 3 days on the last day of my period I went for the 3 month injection (first injection ever) 2 day after that I had unprotected sex with my fiancé.from a hour later I got really bad pains it almost feels like period pains and I don't know. If that is normal.Can I be pregnant?