Cramps after sex?!

Janice
So I'm 4w6d today and today was the first time we've had sex since we found out I was pregnant right now. Right after I started experiencing a sharp pain in my lower abdomen no blood no discharge just pain I'm pretty scared now I can't even walk right now cuz of the pain anyone had this before? Should I go to the ER? I don't know 😭😪