Hello everyone, well basically I'm looking for some advice I'm going crazy!! So I'm trying to track down my fertile days so one friend told my download glow another told me to download <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>( it's basically just like glow) now here the problem my last period was omg December 16-20 on glow it's saying my fertile days are from December 29th- January 4th but on <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> it's saying December 25th-January 1st ??? Which one should I go by I'm so confused?!