I had sex for the first time on Feb. 14. It was my 8th day of my cycle; my period lasts 7 days. We used a condom and it didn't break. I started worrying about the possibility of pregnancy a few weeks later, though I had no signs. I should have gotten my period last week. I go 27-33 days so Friday was the last possible day i could get it. My breasts haven't changed though I've been making a lot of trips to the bathroom to urinate, and have been tired lately which is making me worry more. I also have a little nausea every now and again, though i don't know if that could be stress. I'm going to take a test tomorrow and hope that its negative. Is there any advice you can give me?