I am female, 20 years old, 5'2" and 45.3 kg. I am pregnant but during my ultrasound, there is no embryo and yolk sac. My uterus is seven weeks and three days having 3.1 mm. Seven days after the ultrasound I had bleeding but it was light, the color was dark red, brown or black and it was like an intestine like a tube. I went to my doctor two days after I noticed the bleeding. My doctor said that it was a uterine tissue. She did an ultrasound on me again and its size was 3.3 mm, eight weeks pregnant. Still no yolk sack and embryo. I still have bleeding after my ultrasound and it has been three days. Now my blood is reddish and I have some blood clot that colors black or dark red. What to do? Do I have a miscarriage?