Period after round 1 of Clomid

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I took Clomid 50 mg on November 15-19 (cd 5-9) .. I got my peak opk on Nov 29/30. Had my progesterone checked on cd21 which was December 1st and it was 3.23 😕

So anyway, fast forward to early this morning, Dec. 13, my period started in the middle of the night and it was heavy and I had realllyyy bad cramps! Has anyone experienced bad periods after taking Clomid? I still want to take it again this cycle!