Missed period

Hey guys , i had unprotected sex Friday because i was a little tipsy and forgot my period was coming on Saturday. He didn’t nut in me or anything for sure but now my period is 6 days late , i took a pregnancy test the other day and went to the hospital yesterday but nothing showed up everything was negative. I got my period on time last month please help me . My cervix is hard , up and open btw 😩