When should I test?

Ashley
My husband and I are currently TTC and according to glow Saturday will be 12 dpo but according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> Saturday will only be 9 dpo. Af due the  17th according to glow but due the 24th according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>... When would I test?