So, my period has always been irregular, but I'm scared I might be pregnant... It's been over three weeks since I had unprotected sex and today I've been feeling nothing but nausea and headaches. The person I did it with came over a few days ago and he was sick, so I'm kinda hoping I caught what he had. I haven't taken a pregnancy test for fear that it'll be positive. I just need someone else's thoughts... Needless to say, I'm scared.