I had unprotected sex last feb25&i'm a bit stress&had brown spot before my period. and now im 6 days delayed and had a mild cramps. what is this?

This is time to...: Consider doing a home pregnancy test. Home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, or medications. A correctly done urine test gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) or 1 week after missing a period.