Is the first menstruation 20 days after abortion normal?

The first menstrual period after abortion 20 days is abnormal. The first menstrual period after abortion generally increases the amount of menstruation, but the menstrual period is usually extended to 20 days is abnormal, may be related to intrauterine residue, gynecological diseases, etc. If it is intrauterine residue, need to clear the palace treatment as soon as possible.