TMI: When should I be concerned?

I'm 9 weeks on Monday. I had to go to the ER at 5 1/2 weeks for spotting and cramping. They said baby was fine. I also have had my first appointment with my dr at 7 1/2 weeks. Also no problems. Tonight I started spotting with light pink spotting and brown discharge. No cramping. Should I be concerned? At what point do I need to see a dr? This is my first pregnancy and I don't know what is and is not normal. 

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