After the injection, your period will come on time, because the injection is used to promote ovulation and will not affect your menstrual cycle, but will come according to your original menstrual cycle. However, each person’s constitution is different and some people may delay their periods for more than a week. The effect of the use of the regimen on menstruation is only temporary and has no effect on the future menstrual cycle, so do not worry too much. If your period is delayed for more than a week, there is a possibility of pregnancy and you need to go to the hospital for an early pregnancy test. If you are not pregnant, you need to have a sex hormone six test to rule out endocrine disorder as the cause. If you use ovulation promotion drugs, you need to use them reasonably under the guidance of a doctor to avoid improper use affecting your health and easily overstimulating the ovaries, which can cause ovarian hyperstimulation syndrome and easily cause abdominal pain, ascites and other discomforts.