Brown blood


So I know brown means it's old but since a day before I found out I was pregnant, Sunday, I have had a little brown blood everyday. Today was a little more than before. I've had cramping but nothing bad, only uncomfortable and not painful. I'm really worried though because I've had multiple miscarriages. At what point would you be concerned?? I've constantly heard that it can be normal to have some spotting and that's what it seems to be but I'm just not sure. I did do a lot of walking today. Maybe that didn't help? Any advice on staying calm?