Period cramps during exercise?

Within the last year my cramps got more intense & my periods became irregular. My cycle is around 40 days & I often experience spotting between cycles. In March my dr found a cyst on my left ovary, but no PCOS 🤷‍♀️ I was told to keep an eye on it. But recently I’ve been kinda concerned. I notice that when I run, regardless of where I am in my cycle, I experience the same pain one would have on their period without actually being on my period. I also bloat to the point where I literally look six months pregnant 😭😅 I’ve tried cutting out gluten & dairy to make sure it wasn’t food related, but that didn’t work :/ anyways, I haven’t gotten checked for endo, but I’m wondering if anyone with endo has a similar experience? I only doubt it for myself because usually Advil handles cramps