Delayed menstruation after a medical abortion is a normal physiological phenomenon if it is within seven days. After a medical abortion, the development of the ovaries is inhibited and ovulation may be delayed, causing a delay in menstruation. If you have had a regular menstrual cycle in the past, it is normal to delay your period for one week after a medical abortion. If your menstrual cycle was irregular in the past, maybe 30 or 50 days, it is also normal to have a delayed period after a medical abortion. If the delay is too long, go to the hospital for the appropriate examination. If there is residue in the uterine cavity after a medical abortion or if the medical abortion fails, continued pregnancy may also cause a delay in menstruation.