Brown Spotting? IB?

According to Glow I ovulated April 19th, on 14DPO (May 3rd) I had brown spotting when I wiped (TMI) .. I was told I’m starting my period, (by that time the app said I was 3 days late) but I’ve never started a period with brown spotting it’s always been red/pink..

I wore a pad the rest of the day and the next day just Incase it was a period starting.. when I changed them nothing was on it.. not even a speck. Could it be implantation bleeding?