12 days late

So two days ago I used a pink Dollar Tree test and got a veryyy faint positive within the time frame. Yesterday and today I used the 88¢ Walmart tests and got BFNs. I'm so confused :( I'm guessing the Dollar Tree test was some sort of evap line even though it was within the time frame? I'll attach a pic of that test so you can see what I mean. I threw away the BFN tests after an hour so no pic.