Has the ob/gyn done a pap smear, an ultrasound and ordered an abdominal MRI to look at the uterus?
You are young! When I was in my 20's, I had a hormone imbalance. It appears when estrogen and progesterone are imbalanced, you can have irregular bleeding and abnormally heavy periods. https://www.chop.edu/conditions-diseases/heavy-menstrual-bleeding-menorrhagia Other reasons are things like fibroids or endometriosis. None is serious if any of those. But when the current health crisis is over, I'd see your ob/gyn or primary care doctor or go to a clinic and they will likely do blood work to check your hormone levels and if they need to be 'rebalanced' and after that do a pap to check you out. Let us know how you are doing!!