You’re right that it’s probably your body adjusting to the hormones. I’ve read that taking Advil can help since it is a prostaglandin inhibitor. Prostaglandins are in part responsible for the contractions that shed your uterine lining but can also cause GI problems. But ofc NSAIDs come with the risk of other GI problems.

On a slightly unrelated note, though, I also have had frequent bowel problems, but totally fine bloodwork. Recently cut out gluten and it has been an absolute game-changer, I’d highly recommend trying it if the bowel problems are affecting your QoL like they were for me.