Pooping problems at 38+3 😖

Shiara • Im an 18 year old FTM, engaged to the love of my life, the beautiful man who gave me my perfect little son 😍 15/18/16💙
So i know this is weird, but literally 5 minutes after i eat, i have to go.. And its usually diarrhea. Its like my body wont keep any food in.. I havent vomitted or anything. Im 38w 3d. What could this be?! I just want it to stop 😖