Fertile = Bad digestion??

Aspen

I’ve been experiencing digestion issues for quite a while now. For a long time it was pretty consistent, I felt like I couldn’t eat anything that would go down right. When I took my diet into consideration and started noticing what affected me and what did it, I found out that I was lactose intolerant, and cut all dairy, and also stopped eating red food dye which I am seemingly allergic to. Since then things have been a lot better, but still occasionally I get the stomach cramps and I’m not able to go to the restroom for days, or sometimes it’s diarrhea. After paying close attention, I noticed that this always occurs when I am fertile. Usually all of the days that my fertile window is open. Is this normal? Does anyone else experienced this? (I wasn’t sure what category to put this in haha I’m new at this)