Pain during sex

Kauthar

My husband and i just had sex. For the 1st time after finding out i am pregnant. I am 5 weeks and 4 days. While we were having sex. I got strong pains. I still am in pain i cant even lay properly. I have never experienced such bad cramps in my lower abdomen and back. Please help. This is my 4th pregnancy. I have a 3 year old son. And had 2 miscarriages. Im so scared.