On march 10th my boyfriend and I had anal sex because I was on my period. (Ended the 11th) I was wearing a tampon & he didn't ejaculate, nor did he before that. We were laying side by side. I have menstrual cycles about 31 days long & think I'll be ovulating around the 20th to 26th. If a bit of precum got on the bottom of my tampon and snuck on in (which I don't think happened) could it still be alive in me when I'm ovulating? Or could sperm even get through my tampon? And do you think the chances of being pregnant are high? I'm super worried.