Stomach issue help?

So I'm 33 weeks tomorrow. I've been constipated for ohhhh 97% of my pregnancy. All of a sudden this week, I can't stop going to the bathroom. My stomach is crampy off and on and I am gassy as can be. I don't have a fever or any other symptoms. Strictly GI issues only. My next appt is in a week and a half. Anyone else have this issue? Trying to decide if I should worry about it or if it's merely just a bit of a stomach bug. Thanks ladies!