Freaking out

Okay I took a test last week got a really really really really faint line so I thought took a test today and I don't believe anything came up I just started to light bleed today and my period isn't due for 5 more days . I have a pregnancy app on my phone and it says I'm 3 weeks and 2 days and that I should be experiencing implantation bleeding soon could this be it? Really creaking out test from last week is the first response and today is dollar tree brand they are both

posted.