Periods after abortion. Kindly help us.

Hi, my friend had a medical abortion last month and she was bleeding for a pretty long time, then she was advised to take trapic 500 and her periods stopped, she underwent an USG and it showed no more retained products but the radiologist has suggested another scan after a week as she has pcod and he said maybe that could interfere with the results. We consulted another doctor about this but he said nothing to worry as there were no RPOC and no need of taking another scan. so everything was fine and going well but suddenly after 10 days she started having black dischage and mild bleeding, this happened exactly after 1 month of her abortion. We're not sure if this is normal monthly periods or if there's something to worry about. Thought of posting this here as we could get many answers from various doctors. Kindly help us.