Had unprotected sex last day of period. i'm 1 week late with nausea,sore nipples and minor cramps. could i pregnant?

Yes: Depending on the length of your cycle and when ovulation occurred, you could be pregnant. You should do a home pregnancy test with the first morning urine.

Yes: You should definitely have a pregnancy test done.

Those would be signs: of pregnancy Without an actual examination, I cannot give specific medical advice on your particular health; The fertile part of the cycle varies and is not easy to predict with 100% accuracy. and testing would determine what is actually going on