In the case of irregular menstruation, ovulation must also be irregular. This is because generally speaking for women with normal menstrual cycles, ovulation is about 14 days before the next menstrual period. However, because of irregular menstruation, it is not known when the next menstrual period will come, thus leading to ovulation, which cannot be correctly projected. In this case, it is recommended that women with irregular periods should never use the safe period method of contraception, because it is impossible to predict the safe period if ovulation is not allowed. In addition, women who are preparing for pregnancy are advised to go to the hospital for ultrasound to monitor ovulation and have intercourse on the day of ovulation to increase the conception rate. In addition, women with irregular menstruation can go to the hospital to check the cause and, if necessary, carry out some symptomatic treatment.