Bleeding CD 18,what does it mean?

Mary🌹
So I'm bleeding very heavily mid-cycle and my cycles are normally 27-29 days. Yesterday on CD18 I had pink and thought yay this must be the elusive implantation bleeding I've read about. Today (CD19) it is full on red flow. I didn't track ovulation this cycle but normally I ovulate CD14. What do you think is happening?

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