What are some accurate period trackers to use or even ovulation?

Hudsonmommy1417

I used eovulation and gotten pregnant by the app with my first pregnancy. I just want an accurate <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period app</a>.

When you do the opk test and temperature early morning. What are the good numbers to look for and what's the bad ones?