Have you been successful in using cycle tracking as birth control?

I am currently pregnant but am thinking about my birth control options after delivery. I really don’t want to go back on the pill as it causes me to lose a lot of hair, increased my blood pressure, and can cause decrease in milk supply (I plan to breastfeed). IUDs and implants also freak me out. We have tried condoms and just don’t love them. I can’t do the patch because of my weight, and I’m not interested in a diaphragm.

A few of my friends do natural family planning and have had success with it. I wanted to see a larger population sample though.

I am talking about tracking my cycle and basal body temp, which I already did before pregnancy. I would obviously avoid sex in my fertile window to prevent pregnancy. If I did get pregnant again, it wouldn’t be the most terrible thing, but if we could prevent naturally until our baby gets a little older that would be great too.