Confusing pregnancy tests

My period isn't due until tomorrow or Sunday. It varies ever since I got off birth control in July. Anyways, I'm really hoping someone can shed light on my situation. Yesterday, I tested with wondfo hpt and it came back clearly positive. I took two of those, and then I decided that I should take a digital because I would love to see "pregnant" come up... Well, it didn't. Today I tested again with Wondfo hpt and I got a very faint line... I'm praying for the best and that AF doesn't decided to show up. Someone please shed some light on this.