Am I Pregnant or Not ?

Hello everyone i’m asking for the best advice that anyone has , please! I had sex unprotected Nov 21 . Don’t think he came in me but we were both really drunk so who knows . anyways , it is now Jan 8 & still no period . i spotted ABOUT 3 weeks after i had sex thinking it was my period . according to this app my period is 30days late today (Jan8) . i’ve took quite a few of pregnancy test from the time i started spotting .. being pregnant was never a thought . all negative , i haven’t took one in about 2 weeks but all the ones before were negative . i’m gonna go to my doctor as soon as i can , just asking what anyone may think is going on ? as far as symptom wise - i’ve had headaches , hot flashes , feeling nauseous , darker / somewhat bumpy nipples , mild cramps that are no where near as bad as period cramps and the spotting a few weeks after sex and then today . my period has been on time ranging from 24-28 days that’s why i’m not understanding why it’s not here yet . if i could be pregnant why were the pregnancy test negative that i took in the month of december ? (HAVENT TOOK ONE IN ABOUT 2 WEEKS SO IT MAY BE DIFFERENT NEXT TIME )