Warning: TMI

Lo • My little baby doll will be here June 7th!!!!👧🏾🎀💗
I'd like to know if anyone has had diarrhea right before or up to a couple weeks before going into labor? 
I am usually pretty stopped up and I get a BM out about once a week. Today out of nowhere, literally right after stepping in the house from my OB appt and ultrasound I have this horrible cramping and gas. I ran to the toilet. Just a little info: I didn't drink or eat anything I don't usually consume. 30+5 weeks and I have a little lower than normal amniotic fluid.