Why does bleeding occur after sexual intercourse after taking a miscarriage pill?

Patient's question:

Doctor. The girl stopped bleeding after taking the abortion pill two or three days later. About a week later, she had sex again. Three days after having sex, she had slight bleeding and some discomfort in her abdomen. What tests should she have at the hospital for a thorough check-up? Is it serious? Can it be transmitted?

Doctor's answer:

According to your description of the condition, after taking medication for an abortion, it is generally not possible for everything to be completely expelled within two or three days. It is only a temporary cessation of bleeding. If you engage in sexual activity one week later, the impact on the uterus may cause the remaining decidua and other tissues in the uterine cavity to flow out again. In your case, it is likely that there is residual tissue remaining in the uterine cavity. You should go to the hospital for a detailed transvaginal ultrasound examination. If there is a significant amount of residual tissue, further uterine aspiration surgery may be necessary. There is a possibility of infection, but the likelihood is not very high.

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