Period over but having dull pains

NG

I get really bad cramps when I menstruate and actually use mefenamic acid to manage the pain since nothing else seems to help. My cramping usually subsides around day 3. But this cycle it didn't my period finished three days ago but I still have dull cramping/pain as if I'm still menstruating.

Just to add my tube are tied so I don't think pg is the problem here

Any lady on here that ever experience this?