It's been a little over a month since I've had sex last, with out a condom, but we used the pull out method. About a week later I had a brown discharge for a couple of days, then started a heavy period. A few weeks later (now) I often feel that my stomach is very tight, and a little nausea. I'm wondering what this could be, pregancy? or just my mind playing tricks on me. I've been wondering if I'm pregnant for about a week now, and I don't know if this has led me to believe that I am. If there's any information about this I would appreciate knowing!