I had unprotected sex with my boyfriend the morning I started my period (6/3/16) and ever since I got off (6/8/16) I've been cramping badly and my back has been hurting. I've felt sick to my stomach since that day too. Yesterday (6/10/16) my breast were feeling sore. I took a shot of margarita with my roommate yesterday and I threw up almost immediately. I've had to pee a lot more lately and when I woke up this morning I felt sick. I almost threw up to the smell of the food she made for me and didn't like the taste of the ranch we were using. I can smell stuff a lot stronger than usual and she said she couldn't smell what I could smell. I've been getting horrible headaches since I got off. Could I possibly be pregnant?