At 11dpo i started bleeding very heavy what is this?

Period: At 11 days post ovulation, heavy bleeding is most likely to be a period. No pregnancy this cycle

A period: An early period? Periods usually start about fourteen days after ovulation.

Period: You likely had a short luteal phase cycle this month. That was probably your regular period.

Retained Product or: Most commonly due retained products or infection. You need to get to the ER or call your OB/Gyn.