The medication abortion has been one month, and there is still black blood, not much only

Patient's question:

Patient Age: 23
Detailed Condition and Purpose of Consultation: I had a medication abortion a month ago, but there is still black bleeding, though the amount is not much. The gestational sac was confirmed to be expelled at the hospital. Right after the procedure, there was no bleeding for about 10 minutes, but then it started again. The bleeding is intermittent—there are days with bleeding and days without. Now, it has returned for 6 days straight, and it's always black. Is this normal? Also, I feel mild abdominal pain whenever I do some light exercise. How long do you think this situation will last, and do I need to go to the hospital for further examination?
Medical History: None
First Follow-up Question: I have been taking Motherwort (Yìmǔcǎo) already.

Doctor's answer:

Suggestion: Generally, menstruation lasts for about 3 to 7 days. However, some people may experience a small amount of bleeding again a day or two after their period has ended, which is commonly referred to as "returning menstruation." This duration can vary from half a day to several days. This is not a disease but a normal phenomenon. If you still feel concerned or have other discomforts, such as abdominal pain or excessive bleeding, you can visit the hospital for relevant examinations.