Diarrhea with period every month

I’ve started to notice a pattern of 1-2 days of diarrhea every month while I’m on my period since having my second child. It’s frustrating because it makes me feel kind of sick and sluggish and dehydrated feeling with indigestion type feeling for those days. Kind of like having a mild stomach virus every month. Does anyone have any remedy for this? I eat pretty clean and healthy and stay pretty hydrated, I take a multivitamin. I’m not sure what else to do but I’m over feeling sick every month on top of the usual PMS symptoms.