Had my first depo shot then a week or two before I was due for my second I had unprotected sex a few times. I have been feeling very nauseous,sore breasts, slight darkening of areola, and constant headaches and abdomen cramps. Woke up at 2 in the morning the last couple days with horrible stomach cramps and throwing up too. Took two HPT both came up negative, but I think I took them too early. Had brownish discharge a week after last time of unprotected sex, but it was only noticeable when I wiped. It's been a little over three weeks since I may have conceieved, I am ttc so could this be in my head or should I see a doctor??