After abortion surgery, there are many reasons for the delay of the second period, as follows: 1, another pregnancy: if the ultrasound review after abortion surgery does not have any residue, the first period comes normally, indicating that ovulation is resumed within one month after abortion surgery, and the endothelial lining is basically back to normal. If the second period is delayed for more than a week, there is a possibility of another pregnancy. After the first period, if you have sex without contraception, first of all, we should rule out the situation of unwanted pregnancy. More than 12 days after the last intercourse, you can use the pregnancy test stick to take a preliminary test first, if it shows positive, there may be another pregnancy.2, ovulation is not normal: if it shows negative, completely exclude the pregnancy, this situation may be the second month of ovulation is not normal, this is also a normal phenomenon, because 3-6 months after the abortion of menstruation or ovulation may be not normal, to slowly recover. In this case, you need to go to the hospital for an ultrasound examination, and if necessary, use progesterone to promote the onset of menstruation, and observe the subsequent menstrual cycle.