Bleeding question, AF or possible IB?

I took a pregnancy test yesterday ( 10 DPO) and got a BFN. This morning (11 DPO) when I when I wiped I had slight brown bleeding, but nothing the rest of the day. AF is suppose to be here in two days, so I realize its cutting it close. Is this most likely AF or could it possible be IB? 

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