Birth control question

So I can’t be on birth control because of some other medical issues and medication I’m on. I just had my daughter 2 months ago and I’m not planning to get pregnant again until atleast summer 2023. We can use condoms and pull out etc even though it’s a pain... another baby soon would be a bigger one. But I was thinking of tracking my ovulation. I did this when I did fertility but wondering if it would work backwards... ie avoidimg says that I start to peak. I know there’s usually a 5 day window... but curious if anyone else is doing this and if it’s working. If we get pregnant we’ll be fine. I just wanted a break since my pregnancy was so rough 😅