Joy,
I used NPC. I was at a place in my life where I wasn't really ttc but, didn't want to take BCP or any other meds. I never had AF on my own. I would use it for 14 days and then stop. If you do not want to O, you can use it 21 days and then stop. AF would usually show shortly there after. It seemed like that I felt better when using the NPC. I had major hormone problems previously. Everything was really out of whack and I decided to try the NPC. I can NOT take BCP either. They make me absolutely crazy. I stopped using it because I wanted to ttc. So, I started met. I am now preg but, would definitely use it again.
Here is a link so that you can read more about it.
http://www.infertilityworkshop.com/a...ogesterone.htm
Good luck.