I started having some very, very light brown spotting yesterday, but it stopped after about an hour. A little more this morning, but it's stopped again. No cramping, so I'm not going to worry too much.
I also had brown spotting from week 8 through 11 when I was pregnant with my twin girls, and everything turned out fine then.
My midwife said that cramping without bleeding is OK, bleeding without cramping is OK, but the two together may be a concern. She said that 1/3 of all pregnant women will have some kind of bleeding, and the majority of those pregnancies will continue normally.
Good luck to all!