Getting worried...

Sooooo... I may have forgotten to take my pill a few times this month... and now my period is late by a day (was supposed to start on 5/6/17 according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>). Also, I might have spotted? Like there was some colored discharge on my panties from overnight, but it didn't progress to a period.. I'm getting worried.

So my question to you is when should I take a pregnancy test? Do you trust dollar store brand tests? Thanks everyone