Exclusively breastfeeding

I had my second baby July 5th of 2017. She is 8 months today ( March 5th , 2018 ) and is exclusively breastfed and has been since day one. And when I say exclusively breastfed I mean no bottles. No pacifier. No sippy cup. Only mama and my milk. Lol. She still doesn’t quite like baby food so she only has a couple bites at each feeding but loves snacking on the puffs and yogurt melts. Anyway my question is, is there any other exclusively breastfed moms that hasn’t started their period yet. Of course I had my 6 week period after I had my daughter but haven’t had my first official period yet lol. I think I’m gonna be one of those who doesn’t get one till their done breastfeeding which isn’t gonna happen till my little one decides to take a bottle or sippy cup. I’m trying to avoid pregnancy. I’m on the pill. But after your baby turns 6 months you start ovulating again even if your not having your monthly. How do I track that? Because I would hate to get pregnant again. Even though I’m on birth control I’ve seen it happen before. And I really don’t want to tell my husband he has to wear a condom. I’m just done having kids right now lol. I have a 2 year old son and then my 8 month old daughter so my family is complete. How do you track you ovulation without having a period?