I am worried that I may be pregnant, I need advice on what I should do. I am one week late for my period and I went to the dollar store and bought and took a test on the first day I missed, and it read negative. I always start my new cycle on the 4th or 5th of the month. I had unprotected sexual intercourse on the 17th of September, and i was supposed to start last week around the 4th or 5th. My cycle is around 29 days. The night before I was supposed to start, I had cramps off and on, but no period. I also had something strange happen to me that has never happened to me before. I woke up at 3am with hot flashes and I was sweating. I had the air conditioner high, and i was wearing my shorts and tank top. I've noticed that this week, I have been a lot more hungry, irritated on and off, headaches,and sleeping more. What could be going on?