Someone help me out with this app?

Starr
With the overview of my period, it has like a 'fertile window'? What is that exactly? I mean, I can assume it's to do with my vagina and shit but should I avoid having sex then? Do I have sex? I reeeeeaaaaallly don't want kids right now and I'm taking all of the precautions I can.
Edit: I'm not on anymore form of birth control right now due to horrible experience with past methods, but I use condoms, which I know isn't really reliable but I don't really get a choice lol 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors