Implantation bleeding?

So I came off my period a week ago today and according to another <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period app</a> "Pink Pad" my fertile days start tomorrow. And according to Glow my days start the latter part of this week. Here's the catch, when I wiped a few mins ago I had a light pink discharge. Could this be implantation bleeding or what?