Spotting/light period- what???

Jamie
I'm confused and want others thoughts/opinions. 
I started lightly spotting last Friday night (10/7)- like bright pink. This was a week early than when my period was supposed to come according to glow and my periods are very regular.
I only very lightly bled 3 days- also strange for myself. All bright red. No cramping, nothing like my typical period. 
Then today I wiped and light red/pink again! Not enough for it to be on my underwear but still odd to me. 
WHAT IS THIS? MY PERIOD!? it's going to be hard to tell when I'm ovulating this month!!! Ugh