When are my most fertile days!

Yasmin • Have a teen from previous. Married for 7 yrs, 1 natural mc in 6-2014, chem in Dec 2014 & Jan 2015. We are now pregnant!
Hi my peeps! My <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> was working fine before but when I got my BFP I thought I didn't need Glow anymore to ttc. I just recently had a chivalry pregnancy and now that I'm back on Glow, I can't find my green days this are highlighted telling me when I'm most fertile. Is there another way to find out on my own without waiting for my <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> to get fixed? Thanks!