sick or should I call ob?

Kat
The last two nights I've woken up with cramps and stomach pains. Yesterday it felt better after a couple of rounds of diarrhea (sorry for the tmi). Started again yesterday evening and all last night it was terrible. My whole stomach and lower stomach were hurting so bad and even my lower back. I couldn't sleep at all. Had a couple of bowel movements this morning but still had stomach cramping.  Then I ate a bowl of cereal and threw the whole thing up. Still having stomach pains and cramps. I'm thinking it's a stomach bug, but do you think I should call my doctor just to be safe? I hate to bother them with dumb questions. I'm 13 weeks.