37 weeks pregnant with a baad stomach ache?

I woke up from a nap drank some orange juice, ate banana cream pie pudding and a cookies and creme bar and got a baaad stomach ache shortly after then threw up and went number 2 (sorry tmi.) My tummy still hurts after drinking water :( what should I do? Nothing has ever happened from oj and pudding before so I'm thinking it was the choc bar.