Unprotected sex, late period

Ok so first off I am a complete idiot for having unprotected sex, I know this. My s/o and I have been together for almost 10 years so nbd. We had unprotected sex February 13. It was not a fertile day for me. My period is 4 days late and I have no usual symptoms. Also no pregnancy symptoms. My period has been regular for the last year. Should I take a pregnancy test or wait a few more days?