Period and positive tests

Lindsey

My <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> says my period is due this Friday but my Ovia app says it’s due Sunday. I am 12 dpo (based on my LH tests). Would that effect my lines on a test if my period is due Sunday? I’ve been getting faint positives since 9dpo and barely getting darker.