Last weekend, with a lapse in judgement my boyfriend and I had anal sex. We were careful to keep things where they should be and to carefully clean ourselves up afterwards. As far as I know, nothing leaked out and his penis never had contact with my vagina. My last period started on September 14th. We had anal sex both Sept 29th and 30th. I took Plan B within 72 hours beginning 10/1. I took the pills almost exactly 12 hours apart (within minutes of being exact.) I have had several side effects including fatigue, bad headache, dizziness, and a tiny bit of nausea here and there but not much. Do I need to be very worried about pregnancy? I'm still a little worried, but do I need to worry too much? I do have a hormonal imbalance (estrogen dominant) and my period WAS early last month but with absolutely no positive pregnancy test at all (and really no possibility of it being positive.) I've also been worried about how much MORE Plan B will mess up my already existing imbalance. Please help calm a poor girl's fragile nerves.