how do you know if you miscarried?

iL
So for the past two days I haven't felt pregnant. No moodiness, no more uncomfortable belly that made me feel like I ate too much.... so I decided to go for a run yesterday. 
Prior to pregnancy I ran often and worked out more often than running (Pilates, lifting fees sacks, farmwork etc) 
I felt so good I ran two miles and stopped anytime I felt crampy. 
Well this morning I had blood in my discharge. I know this is TMI but it looked like old blood, it was kind of light brownish. 
My husband had been all but keeping me on bed rest for fear of miscarriage and now I'm afraid I took my little bit of liberty to far and hurt our baby.... does this sound like a miscarriage? 

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