Not ejaculating inside refers to the situation where semen is not ejaculated into the vagina during sexual activity. With irregular menstruation and semen not ejaculated into the vagina during sexual activity, the chance of pregnancy is lower, but pregnancy cannot be completely ruled out. Menstruation is primarily regulated by the sex hormones secreted by the ovaries. Irregular menstruation usually refers to abnormal menstrual cycles and menstrual flow, indicating abnormal endocrine function of the ovaries and an imbalance in sex hormone levels, which may likely result in an inability to ovulate. Even if ovulation occurs, the fertilized egg may not successfully implant in the uterine lining. Additionally, if ejaculation does not occur inside the vagina during sexual activity, generally no sperm will enter the vagina, preventing fertilization of the egg and thus reducing the chance of pregnancy. Irregular menstruation only indicates a lower chance of ovulation, but ovulation can still occur in some cases. Before ejaculation, a small amount of prostatic fluid may be secreted, which may contain a few sperms, leading to a small chance of pregnancy in some situations. If pregnancy is not desired, effective contraceptive measures should be taken, such as correctly using a condom, taking oral contraceptives like Levonorgestrel Tablets or Drospirenone and Ethinyl Estradiol Tablets as prescribed by a doctor, or placing an intrauterine device to prevent unplanned pregnancy.
