Avoiding pregnancy without birth control?

Hey everyone!
So I've been taking the pill for 7 years now, and I came to realise it was just not working for my body (put on weight, cellulite, mood, etc). I recently decided to stop it, and go natural because I don't want to stop the pill if it's to start something else like implant etc. 
Thing is, I've been with my boyfriend for a while now, and I don't really want to have to use condoms again.. 
So I wanted to ask you if it was safe enough or completely dumb and naive to be relying only on the Glow fertile days predictions in order to avoid getting pregnant ? Cause we've been avoiding those "green days", but have unprotected sexe on the other "safe" days. 
I'm just freaked about getting pregnant, but I'm really sick of all the unnatural and chemical birth control options. Do any of you have natural control solutions? Thank you so much! :)