Okay so yesterday me and my boyfriend had sex, im going to tell you the story... at first he went in without a condom and I had thought he had one so I didn't stop him until he grabbed one. After he put it on we were okay but after he came we realized the condom had came off and we don't know when. I was really worried so we got a plan B. But I'm still really worried because according to the app, i had a 15% chance of pregnancy and I was 4 days into fertility. I just took the plan B an hour ago. Should I still be worried? Thank you