I don't personally see what the E.R. will do any sooner than waiting for tomorrow, especially for a bit of blood. There isn't anything you can do to prevent anything from happening at this stage in the game except try very hard to stay calm. I have experienced bleeding all through my pregnancy, in the exact way that you explain. I am now 24 weeks. I thought I had a miscarriage, or was going to have one due to the bleeding, however come to find out, I have a polyps that is the root cause of the bleeding. They can't take care of it until after the pregnancy, so, I just have to deal with the bleeding and try not to freak out.... very unsettling, I know! Good luck to you. I wish you all the best :-)