6 weeks pregnant and having pain during ?

i am 6 wks pregnant and today my partner and i had and it was very painfull, after the pain was sooo bad i was having extreme pain in my abdomen, in my back and running down my legs. i was curled up and crying in pain it continued for about 5-10min. this does not seem right and i am very concerned, is this normal? this is my second pregnancy and i had nothing like this with my first. has anyone else had anything like this???