hey I have a question that i got my last periods on February 15, 2015 and me and my bf had sex on 6 February 2015 and we didnt use any protection and he didnt *** in me but after one hour of it i took plan B pill just for the safe side but i m having cramping and its March 15 and i still didn't get my periods. The question is can v conceive in an hour?