TMI - spotting or miscarriage?

I'm 6 weeks pregnant. When I went to the restroom today I noticed brown blood when I wiped. By the end of the day I ended up with about a teaspoon in my underwear (sorry tmi). No cramping. 
I have been reading that it is normal to have spotting at this point in the pregnancy but how much is too much? 
Has anyone else experienced spotting or a miscarriage that can give me some advice?
Thanks in advance. 
Signed,
A worried (hopeful) mom to be

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