While it's hard not to worry, try to remain calm. I was told bright red blood is more of a concern that brown because red means fresh. I had red spotting at around 14 weeks and it was probably due to over doing things. Your doc is doing the right things by moving up the ultrasound.
*Hugs* I will be thinking about you. By that I mean saying a few prayers, but some ppl get weird about that.
Glad you were able to get in earlier. Hope you have a great ultrasound tomorrow.
Me <3 comments... and chocolate peanut butter cups!