Fertile days are now green

I only check my glow a few times a month to know where I'm at. I noticed that my "red days" aka fertile days are now green. We are currently NOT trying to conceive and use natural birth control. Is there any reason why it is now green? I actually thought they did a yeah go ahead it's safe days update, but then noticed the pregnancy chance percentage. That was a close one! But seriously is there a reason why it's green now? My options are still the same at avoiding pregnancy.