i had my period last month and everhting was fine a couple days after my period i had unprotected sex my boyfriend pulled out, which i know is not the best thing, but i am also on birth control. it is not a couple weeks later and everytime i eat about 20 mins later i get really bad cramps and have diorreah. i dont know why this is happening. i dont feel sick or anything else. could i be pregnant? what should i do?

That doesn't sound like a pregnancy symptom to me. If you've had diarrhea for more than 3 days, you should see your doctor. It sounds more like you have a bug of some kind.