Glow af date vs Eve af date???

So I cannot download Glow on this phone for some reason. I've used Glow for years, but now I have <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>. I'm ttc but I at least need to keep track.

Last month my period came 10 days late. So I started May 1st. This was also the first month I used <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>... Anyway... Glow says af is due June 2nd...<a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> says the 4th...which do go by for testing purposes? Help lol