Is it normal for a medical abortion to expel the pregnancy sac but have an echo?

A medical abortion in which the gestational sac is expelled but there is an echo is also a normal condition.
The pregnancy bag has been discharged after the medical abortion, but the ultrasound examination has echo, is a normal situation. This is because the pregnancy bag is discharged out of the body, there is still some residue in the uterine cavity, ultrasound will appear echo, can be applied under the guidance of the doctor to promote uterine contraction, such as uterine contraction, to help the discharge of bad dew.
If the residue in the uterine cavity after medical abortion has not been able to be discharged, more than 3 weeks still, it is necessary to promptly according to the comprehensive analysis and judgment of obstetricians and gynecologists, as soon as possible to take the purging operation, remove the residual endometrium in the uterus and so on.
Therefore, medical abortion gestational sac discharge, but ultrasound suggests that there are echoes, should cooperate with the doctor to take medical means to promote the discharge of intrauterine residues.