I had unprotected sex about 2 weeks ago, well about 2 days ago I started getting sick, nausea right when I woke up and then it would stop and start all day, my back and head hurts, I've tried taking all the Advil I could and it won't go away. I've been to tired to even go to the bathroom, my friend said if I pee a lot I might be pregnant and I have, I did get my period but it came really early and wasn't as heavy as usual, it would just stop for an hour or two then start. Both pregnancy test said negative.