Is this Af or IB tmi

Summer
So af isn't supposed to be here until Sunday, my cycles range from 31-39 days.
I started spotting brown last night, and in person there wasn't even that red hue. 
What is this?  It's gone now . 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors