Progesterone is released by your body after you o, so technically, no, NPC will
not make you o.
But, and there's always a but

, the cycle I got pg, was looooooong. I was temping and using OPK's. I got a + OPK, but never a temp rise. The +OPK was around CD20. I POAS at 19DPO, 22DPO, 27DPO and finally 30DPO before I got my BFP, but when I went in for my first (and 2nd) u/s, my OB said that I was 2 weeks behind what I thought I was. I started using NPC from 3DPO until 18DPO (I POAS before I would have used NPC on 19DPO), but somehow, I o'd while using NPC.
However, that is normally not the case. If you use NPC to start AF after a long cycle, you would want to use it like you would use BPC's - 3 weeks on and 1 week off. If you want to use it after o'ing, you would start around 3DPO until either AF starts or BFP.
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Becky (30) & Greg (33)
Furbaby - Jake - 2/4/98 - 10/3/09
Furbaby - Daisy - 9/18/08
Kaitlyn Ann - 3/1/08
Molly June - 2/13/09
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