Please help I need advice

Alisha

I had unprotected sex and my period is 6 days late. That's unusual for me. All day yesterday from the time I woke up to the time I went to bed my breasts were sore. It was like a dull ache. Last month I was 4 days late and my period lasted 7 days. I only have it for 4 days normally. Should I go get a pregnancy test? Could I be pregnant or is my period just late? Please help!