clueless...

I'm not very educated in the feminine cycle (if that's what you call it) lol. my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> says I was 20 days late. It must've been from stress because it's never been that long. I'm not sure what spotting is? I wiped and it's a light red. is that it? or is that discharge? sorry for all the questions. 
also is there a specific reason why it might be light red and I feel like I'm on my period.