Cramps.. Fertile?

Brianna
I'm on my 7th day of my fertile window according to glow. Sunday I had a 33% chance of pregnancy, yesterday a 27% chance & today 8%. I have really bad cramps & keep having to go the bathroom (poo). My period isn't due for another 16 or 17 days. Is this normal during ovulation or why am I experiencing cramps & having to go?