Just after menstruation is a safe period for women, but it is not safe. This is because ovulation can be affected by many factors, such as seasonal changes, mood swings, increased stress, changes in work and school environments, etc. Ovulation can be disrupted. Ovulation can be disturbed and can occur either during ovulation or during the safe period, and impromptu ovulation can occur when a woman is excited or has a change in mood. If the patient does not require pregnancy, it is recommended to use contraception at all times and to use contraception throughout. It is recommended that condoms be used for contraception, which is safer and more convenient, rather than the pill or in vitro ejaculation.