***Need help on this one ladies!! Please??!!

I went to the bathroom yesterday and as I was wiping I noticed light blood. Its too soon for my period.. Glow is usually right at predicting my periods with a couple of days off here and there. My period is not due until the end of this month. Normally I get signs before my period like sore breast, cramping, back pain.. Etc but this light blood caught me completely off guard. It only lasted a couple of hours yesterday and now no sign of blood at all... What is it?

Is it too early to test?