I have not had a period since may. I've taken 4 pregnancy tests, and they were all negative. I talked to my doctor about it and he did an ultrasound. So I know I'm not pregnant, they would have been able to tell. I've been having cramps like period cramps, nausea, headaches almost every night, and it seems like I can't gain weight, I just keep losing it. I had a baby 5 1/2 months ago and I weigh less now then I did before I got pregnant. If anyone knows what could be going on, PLEASE let me know. 8-|