Cramps

Hi everyone. I would really appreciate some advice please. I'm around 5weeks with our first. My husband and I just tried to have sex (I say tried because it was an epic fail). Foreplay was great, but as soon as we achieved penetration something felt wrong, (like it was too deep) I stopped to go pee- thinking maybe this was the problem- then out of nowhere CRAZY INTENSE CRAMPS! I was almost in tears. The pain lasted around 30 minutes and has partially subsided now. (With the aid of a heat pack)

The only info I can find pertains to orgasm and semen causing cramping. Of which I had neither. . . What is going on??