Period Problems

So I've always had issues with my period. They always lasted 2 weeks and then I'd only be off it for a week (maybe less) before it started again - and that's why birth control has been in my life some I started my period. Yes, I have changed birth controls over the years. Since I started birth control, my period only lasts 3-5 days, with only bleeding as a symptom (no cramps). This month, today will be my 8th day and I have this cramp that's like under my belly, I guess I'd say? Like, I'm rather skinny so like I guess if I had a little chub, it'd be under that. This is just extremely abnormal for me and it worries me. I do have other health issues such as an enlarged liver, enflamed kidney tube, and thick ovary lining - but all that hasn't caused this sort of pain. I don't really know how to explain it, but it's just different. Does anyone have any idea what could cause this? Could it just be from stress or something?