Im 17. I have been on the birth control shot, Depo Provera, for 3 months. Before that I was on the pill, because I've had my "period" for 4 months but since I started the pill and then the shot it has just been a constant light bleeding. I had sex for the first time 2 months ago. Depo Provera claims that you are 99% not able to get pregnant. I've taken 4 pregnancy tests since then, they have all been negative. About 3 weeks ago I had surgery, so the pain pills caused me to be constipated. Now all of the sudden I became very bloated in these last 4 days, I'm still constipated, I have abdominal pain, haven't been able to eat, haven't been hungry and I always feel nauseous. what does this mean? Pregnant or something else caused by constipation?