Oh no I hope it's not food poison. Maybe you ate too much than what the stomach can handle right now.
I eat too much too and I always regret it after..
Sounds like gas pains :/ but I'm not completely sure. I've had them a few times since being pregnant. Horrible! If you can take a warm bath and pull your knees up to your tummy a few times.
I'm 15 weeks and I get that once a week if I don't take my colace.
You probably are constipated. Try stool softeners.