Oh cr@p love, not what we wanted to hear.
I know that bleeding can be normal in pregnancy, but how you ever come to accept that I'm not quite sure.
If it were me (and I'm not saying anything is wrong) for my own peace of mind I'd be off for another scan. Whilst the bleeding might well be ok, stress is not good for you or bubbies, and I know if it were me I wouldn't rest without knowing 'for sure' that all was well.
Don't worry about bothering people, or being a pest for asking to be scanned again. It's your RIGHT. And if anyone protests, chuck a hissy fit like no-ones business to get your own way.