Bleeding at 10 weeks?

I am about 10 weeks and started spotting pink yesterday and then brown this morning. 
Just this afternoon it turned to bright red blood and a little heavier bleeding. Just enough to cover my panty liner. Light cramping but nothing horrible. 
Doctor sent me in to get rhogram shot, but don't see him till Thursday.
Am I miscarrying or has anyone experienced this and it turned out to be okay?