I had my last period at the end of May and I had sex but the condom came off inside of me. I went, the next morning, to get the Plan B and the 7 dasys later, I had a short mild period. It only lasted for about 3 days and since then I've had sex 2 times and my boyfriend didn't ejaculate inside me. I saw this myself... However, at this point, I don't have any pregnance symptoms (non whatsoever) and it's been about 4 weeks and I haven't seen my period. I am having mild cramps and getting some of the same signs of having my period but nothing has happened. Could you tell me if I need to be worried? Do you think it's off because of the pill?