Quoting Squeaky McGee [19 wks]:" Yeah, that's what they say, but all of my miscarriages started with brown bleeding. Not tying to freak ... [snip!] ... bleeding. Not tying to freak out the OP, but I hate when people say brown blood is harmless, because it isn't always harmless."
but her baby is moving around... brown blood can mean alot of things, i had it and never miscarried. it just depends, but any blood during pregnancy that isnt a typical thing for someone is alarming, and i would deff keep an eye on it, and call if it kept happening.