Brown cm??

I am currently 4w5days...
Weds <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> I noticed pale brown cm, not a flow and only seen when checking cm. No pain nothing?!
I have it again today? But very light. Again only when checking cm. What could this be? I'm getting scared now.