I know exactly what you are going through!!
I started bleeding in my 1st pregnancy at 6 1/2 weeks. It started with bright red blood and, like you, I thought for sure I was mc'ing. For my ENTIRE 1st trimested I had everything from brown spotting to filling a maxi in a matter of minutes (so very scary!). I finally stopped bleeding around 13 weeks and I went on to have a healthy baby! My doctor said that bleeding like that comes from blood vessels trying to attach to the uterine wall and leaking blood. It pools for a little while and then leaks out. Scary, but usually benign.
That being said, and I don't want to scare you, but I want to make you aware of what one doctor told me about the bleeding. Sometimes bleeding in the 1st trimester can be an indicator of placental problems in the 3rd trimester. Since I bled in the 1st and my triple screen was off, my dr said that I was at high risk for placental problems and started watching me VERY close starting the 1st week of my 1st trimester (did a sono). By the 2nd week of my 1st trimester I had low amniotic fluid so he put me on modified bed rest. I truely believe that if he weren't so on top of things we wouldn't have caught it so early and it could had been trouble or I would had to been hospitalized. Like I said, I don't want to scare you, but I want you to be aware so you can watch more closely later on.
It really sounds like your baby is doing fine. Take it easy as much as possible!! Good luck!!