Please help wanna take a Pt but scared

I had sex day before my ovulation started... But 8/29 is when I am supposed to start af. Last week I got hit hard with nausea out of the blue.. And felt cramping here and there.. Also boobs feel very heavy. Now I'm cramping again and its 2 days before my pd starts... This never happens I never get cramps. Could I possibly be pregnant? Also my legs are cramping I'm having watery cm.. And my cervix is tight and hard