Braxton hicks at 25w?

Mkmt
I can't tell if these are Braxton hicks but I think they are? My stomach gets tight (but not painful, just uncomfortable). It started at 24 weeks maybe once or twice a day but they're increasing in frequency to maybe 10 times a day? Also, TMI but I've had diahreah for four days straight and I can't figure out why. I go from one extreme to the other! 
I'm pregnant with twins so I'm worried about pre-term labor. 😐😳😫 I see my MFM Wednesday so I plan on asking then. But he doesn't really see to my care, just the babies. I don't see my OB for another two weeks for the glucose test. 
Should I move that OB appt up or call about the Braxton hicks and gastro-intestinal issues? I feel so silly to call about having the runs! 

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