My breast hurt

Alexx • Someone trying to find herself in this world!
My boyfriend and I have been having alot of sex. (W/out protection) I heard if your pregnant your breast will feel tender and soar. (I also heard sex can mess with your period) They usually do when Im going to start my period. But it usually happens like 2 days before. I've had the pain all week long and unusual cramping. Could I be pregnant or my period just going to be really bad this month?