If you have your period on the 2nd and your menstrual cycle is 30 days, it is possible to get pregnant if you have sex between the 13th and 20th. The time of ovulation is around the 17th, 4 days before and 3 days after the 17th is the ovulation period, and having sex during this period may lead to pregnancy. If you are planning to get pregnant, it is recommended to arrange sex during this period to increase the chance of pregnancy. If you are not planning to get pregnant, it is advisable to use good contraceptive measures if you have sex during this period. It is best to use condoms during the whole process of sexual intercourse, or take oral emergency contraceptive pills within 72 hours after intercourse, which can also achieve the appropriate contraceptive effect.