Veset and medical procedure

I had an endometrial biopsy that rendered me a niddah on day 24 of my cycle. I got my period a few days later. For purposes of calculating my onah days, which day do I use - the day I got my period or the day I became a niddah.

Dear questioner,

Thank you for your question.

Predictions about your cycle next month cannot be made based on your bleeding from the procedure.  The day on which your menstrual flow began should be used to calculate your onot. 

Refuah sheleimah!

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