My periods just came today. they were 16 days late. I also had regular cycle for years and years. Last one week, i was getting sudden 10 sec cramps and thn they go away. This hapened all day. this morning my stomach was hurting a lot more. Went to the bathroom and saw someblood. Now i am bleeding with really bad cramps. I thought i was pregnant because my boobs felt tender, headaches, weakness, felt nauseated. what do you think is the reason and what is going on? Can i still be pregnant?