I had a bright red bleed (quite heavy) at 9 weeks with DD, I was already in hospital at the time having been admitted for HG. I went straight from the toilet to the nurses station & told them. The midwife said not to be worried. Just to wear a pad overnight & if it gets alot worse or hadn't stopped by morning to let her know.
The bleeding stopped by morning but I had an u/s that day just to put my mind at ease.

I suggest that if you're concerned you go & ask for an u/s.... if only to put your mind at ease. Don't be embarrassed or think that you're over-reacting... you have every right to get it checked out.

Good luck & I hope you don't find anymore blood