Help - period or IB?

My periods have varied since I stopped the pill in February. I also have hypothyroidism but it's not serious.

Today I went to the bathroom and when I wiped there was a light period-like amount of blood. I went and got a pad and wiped again and there was nothing there. There's been nothing since.

Glow says I'm not supposed to start for another 11 days.

Glow says I ovulated on Sept 10, so it's too soon to be implantation, right? I don't know what this is. I normally never have any bleeding between periods.