I haven't had sex in a few months to be more clear, about 2 1/2 months. I do not know what is wrong with me, but i used to eat 1 or 2 times a day and now i eat 4 or 5 times a day, I did get my period it actually started a few hours after i had sex. But i have been having a lot of stomach pains not necessarily cramping, but like it and i am not due for my period for a few weeks. my stomach feels harder than it normally is. What could it be?