There is no tissue found. There may be tenderness of the womb and tubes. Bleeding is usually more severe, and there is often abdominal pain With incomplete miscarriage, the bleeding is heavier, and there is almost always abdominal pain. The mouth of the womb is open, and the pregnancy is being expelled. Ultrasound would show some material was still in the womb.
Complete miscarriage is just as it sounds.
There has been bleeding, abdominal pain and the passing of tissue, but the bleeding and pain have usually stopped. If you can see the fetus, you have miscarried. Ultrasound shows an empty womb. Bad genes cause an abnormal fetus and are found in more than 3 out of 4 miscarried fetuses. The risk of bad genes goes up with the mother's age, especially over 35 years.