period after baby...NFP

I'm 4 n a half months post partum n I still haven't gotten my period. my cervix still feels fertile, my cm is clearish yellow n egg white like. I want to do natural family planning cuz I hate using condoms, totally kills the mood. The only form of birth control I like is nuvaring but I'm breastfeeding and don't want to lose my supply. How long after your baby was born  you breastfeeding moms got your period back? Am I still fertile or is my body just taking a while to get back to normal?