Help! Pink spotting and tons of cramps CD15

The title basically says it all but I have never had this before. I had a semi normal period. It was maybe a little shorter than normal. Now CD 15 and having tons of cramping and pink and red colored discharge. Idk what to think. I've never had this. Negative HCG before my period started. What could be causing this?? I'm 3 days before ovulation.

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