Hi - bleeding in pg can be scary - lots of women bleed and it is unexplained. The thing to keep in mind is that brown blood is old blood. Fresh blood is bright red. If you saw your baby on the US this morning and everything is going well, and all you have is brown blood, you probably don't have anything to worry about. The blood could be a week old or even more. I would see the doctor again immediately if you start to have a bright red show.