Early pregnancy went to er heard hb bleeding and blood clots how to tell the difference between miscarriage and clots?

Very difficult : And would require a microscope. An easier way is to measure the pregnancy hormone, hcg, in the mother's blood and then measure it again 2-3 days later. If pregnant, it should increase (usually doubles every 3 days in early pregnancy). Also, depending on how many weeks pregnant (at least 4-5 weeks), transvaginal ultrasound may show evidence of an intrauterine pregnancy.