It sounds as though the ob/gyn is not worried about what he or she saw. If he or she was worried, and IF there was anything that could be done if a problem was identified, you would have been asked to come in sooner.
There are a lot of incidents of bleeding in early pregnancy that have no impact on the pregnancy's outcome. In the early stages the only thing they can have you do is to stay in bed until 24 hours after the bleeding stops. Doctors pretty much are powerless to "heal" anything at this point in pregnancy, it's all up to the embryo(s).
Anyway, try not to worry, your doc's lack of worry is a very good sign. Don't torture yourself by thinking that if they did an ultrasound earlier they would somehow find something and be able to take action. In the early days of pregnancy, there is precious little anyone (besides the embryo) can do.
I bled regularly with most of my pregnancies. I had an u/s every week from weeks 6-10. Then every four weeks till 30 weeks. Then every 2 weeks