What is the reason for increased bleeding four days after medication abortion?

Patient's question:

No

Doctor's answer:

The average number of days of bleeding after the expulsion of the fetal sac in medication-induced abortion is 18 days. The reasons for prolonged bleeding may be incomplete shedding of the decidua, which affects uterine contraction and hemostasis; or incomplete expulsion of the fetal sac, leading to incomplete abortion.