My boyfriend and I had unprotected sex 7 days before my period is due. I am supposed to start it tomorrow. Could I be pregnant? He ejaculated in me. I feel kind of crampy like I'm going to start my period.

Unprotected sex can always lead to pregnancy. You will have to wait and find out for sure.

You'll have to wait two weeks. If your period comes than you're not pregnant. If it doesn't come then you should take a home pregnancy test using the first urine of the day. Cramping can precede a period as much a pregnancy, it isn't a valid symptom.