I had unprotected sex in March for about 5 seconds before coming to my senses. After he pulled out and I looked over there was a very small amount of clear liquid coming put of the tip. Since then I have had what seems to be three normal periods, with all the symptoms and have lasted the same amount of time as they normally do. But this week I have had a lot of gas pains and stomach pains accompanied by headaches, I have also gained a tiny bit of weight in my stomach. I have taken three pregnancy tests during these three months because i've been scared and they have all come out negative. Is there any possibility that I could be pregnant??