Could I be pregnant?

I had unprotected sex 2 days before ovulation, I had a 7.4% chance of pregnancy that day. That was four weeks ago today. Now, these past few days I've had period like cramps, they were really bad yesterday & are now almost gone, also for 3 days in a row last week my boobs were so sore. Is it possible I'm pregnant? I should be starting my period any day now.