Mixed Pregnancy Signs

Pleeeease help. I’m driving myself crazy. This past Saturday I had sex, 3 days before that I got off my period..today is Tuesday(now 3 days after I had sex) and I have felt nauseous all day. Brushing my teeth this morning, was the worst! Now I’m laying in bed, and I’m actually cramping a lot worse then I was earlier in the day. I know this is super soon to tell if a girl is pregnant..but I never feel nauseous just because. If I don’t stop feeling nauseous in a few days, I’m going to call to see if it’s too soon for a blood test. Any advice?🙈