Hello, My boyfriend and I are engaged in sexual outercourse. There was no penetration at all, but, he came on top of my vagina. My last cycle was April 14-18, we had contact on 19-23, and 28-1. I took Plan B on the 6th and is taking birth control till today. My question is, How high is my risk of getting pregnant? Whats the likelihood of sperms from vulva swimming inside? From your professional opinion, should I be worried? Thank you!