Hi my g/f and I are sexually active, i'm 16, she's 18, we're been together for almost 2 years. Its been about maybe 2 or 3 months since she's had her period. Its happend before where she was 2 months late, and didn't end up pregnant. Well we've taken 2 pregnancy test, on a week after she was supposed to get her period, and the other about 2 or 3 weeks later, both turned out negative. We haven't been to a doctor or a planned parenthood, and she hasn't had any sypmtoms of pregnancy, except that she hasn't gotten her period, and she looks like she has gained a couple of pounds, but other than that there hasn't been any other symptoms. So what do I do, i've been planning to go to a doctor, but haven't yet. Why did both of those test come back negative?