Serious question need answers

Katelyn
Ok so I had unprotected sex on the 3rd of November. Well I went on to have nausea and stomach cramps. Then I started having pink on the TP. Than it got heavy for like one day now it's back to being pink. I was supposed to start my period on the 16th of November. I never had any issues like this before even if I was stressed. Could I be pregnant?