The pregnancy rate is usually higher when a woman has unprotected sex during the fertile period. The normal menstrual cycle is divided into the menstrual phase, the follicular phase, the ovulatory phase and the luteal phase. The fertile period is often referred to as the ovulation period, during which unprotected sex is more likely to result in pregnancy. The rest of the period is known as the “safe period”, which is an unreliable method of contraception. If you have unprotected sex during the fertile period, it is recommended that you take the emergency contraceptive pill (ECP) if you do not want to have children. For women who want to have children, it is recommended that they go to the hospital for a blood HCG (human chorionic gonadotropin) test to check whether they are pregnant or not about 10 days after intercourse. In addition, it is recommended that women should pay attention to cleanliness and hygiene after intercourse to prevent the occurrence of gynecological inflammation, such as vaginitis, vulvitis and other diseases. If you need to take contraceptive pills, you need to apply them under the guidance of a professional physician, do not blindly buy drugs to prevent adverse consequences.