Tmi but can't eat anything without diarrhea

Pamela • Blessing with a 2 little boys and baby boy due april 23rd 2019
Im almost 28 weeks and I haven't been able to eat anything without having to run to the bathroom right after I eat.. I googled and can't find a reason I see my family doctor in a few days but just thought to see if any of u ladies have been experiencing this and could help me out