If you have already had a period, it is a sign that you are not pregnant. If you are pregnant, the endometrium will change like a molting membrane and you will no longer have the symptoms of menstruation caused by the endometrium shedding, so if you have already noticed menstruation, it is a sign that you are not pregnant. If you are not planning to get pregnant in your daily life, it is advisable to take active contraceptive measures, preferably using condoms throughout your sexual life. Condoms are relatively simple, safe, hygienic, reliable and effective contraceptive methods, so it is recommended to use them. If you find a small hole in the condom, or if the condom slips out, it is recommended to take the oral emergency contraceptive pill.