TTC & breastfeeding

I had my son in August of this year. I am EBF and have not yet had a period since DS was born. Prior to conceiving, I was told I had PCOS. We were able to conceive naturally, without any medical intervention. Other than cervical mucous and checking BBT, are there other ways to track when I am ovulating? I was using an app to track my cycles, but not having AF to guide me is throwing me off. I have read that breastfeeding is not a reliable former of BC once baby is sleeping more than 6 hours at night. Ideally, we would like to wait until January or Feb to try for baby #2.