Could I Be Pregnant?

I had sex last week & I need to know if I'm pregnant. I am 1 days late & when we had sex he didn't ejactulate but we also didn't use a condom. I sometimes use the bathroom often but I've also been drinking a lot of fluids. My nipples are sore but this happens before my period,durning, and after my period. Someone help! Should I take a test? Could I be pregnant? I'm very scared! Please please please help!