Vaginal bleeding in the early stages of pregnancy is common and does not always mean there is a problem. However, bleeding can be a warning sign of a miscarriage. If all the tests are normal and no cause for the bleeding has been found, then you need not worry.
Pain and bleeding in pregnancy may also be caused by an ectopic pregnancy, which is when the pregnancy is growing outside the womb (uterus), usually in one or the other fallopian tube. It is a relatively infrequent occurrence. A much rarer cause of bleeding is a molar pregnancy in which the placenta (afterbirth) is abnormal. If you would like to know more about ectopic pregnancy, there are individual information leaflets on this topic.