Yeah, I'd ask for an ultrasound to see what's going on? I had bleeding with all 3 of my pregnancies, the most recent pregnancy, went for two weeks around the 8 week mark. Turned out all fine, but they never did work out why. I think until you see the bub on screen with a heartbeat, it's always a bit of a stress wondering what's going on.

Get pushy if this is what you need to, for peace of mind. Hope all is ok