Sooo late

So a week ago today I had sex. And yes we used a condom, but when he finished he finished in me. And now I’m a week late and idk if it’s stress or something but I am breaking out and having all my symptoms from my period. Normally I would get my period at the end of the month. Should I just wait on it or take a test now. Or is it late bc I’m just stressed out? Help!!!