Help period or something else?

I am nine days late on my period and have taken two pregnancy test and both negative but at night on day 8 I started spotting little brown I assumed spotting and today day nine I woke up and no blood or spotting but when I pee blood comes out like it's all red but that's the only time I'm bleeding. 
But prior nights I've been having like terrible heat flashes...
Do yall think its a UTI? Miscarriage? I don't know what to do anymore. 

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