I am 18, I had sex in the middle of October ( it is now 1/6/2011), it was a day after my period ended. My periods are irregular to say the least. The last one was 3 months apart. It has been almost 3 months since my last period. I have had four home pregnancy tests and They all are negative. I have had a history of IBS, my adomen is hard, bloated, and sore in my ovaries. I also have small ovarian cysts as well in the past. My breasts feel like they getting bigger, but I tend to obcess about things and maybe my brain is playing tricks on me. Maybe my boobs are getting bigger and it's completely natural... When I had sex, the guy came outside of me and then we had intercourse after he ejaculated out side of me. Could I be pregnant even though I took four pregnancy test recently and they all were negative??