What do I do next?

I had sex and after the first round he took the condom of and stuck his penis in which may or may not have had cum on it from when he went in the condom. It's been weeks since so I took a pregnancy test which was negative but turned into positive overtime. Afterwards I took three more test in case the first one was evap which all came out negative. However I'm four days late and I've still not received my period for this month. I've had small low key cramps on and off all week. So what should I do next? Should I wait until Dec.1st to see if I miss my period completely or should I go to the doctor asap?