Pregnancy Test Result...

I took a pregnancy test a couple days ago at like 8 pm in the Walmart bathroom because I've just felt different lately. My friend offered to buy me one since she owed me money and so... I took it, waited a little bit, and the results showed a VERY, BARELY visible line. I mean so faint that I think I was just imagining it. But she said she's 80% sure it was there. According to this app my period is due in one day, how long should I wait to take another test? I have one more test, and it's a digital test. I wish I had a pic to show the test I took but now i'm afraid it's too late to really capture what it looked like.

UPDATE: I'm stressing a lot and I heard that pushes back periods but I still haven't started, which is weird. And I wasn't accurate with the period log anyways, I started it later than my period actually started.