During sex, the semen ejaculated by the male partner enters the vagina, passes through the cervix into the uterine cavity, and then enters the fallopian tubes. If it encounters a discharged egg, it can complete the process of fertilization in the abdominal region of the fallopian tube. If ovulation does not occur at this time, the sperm can remain viable for more than 24 hours, and after 48 hours the sperm will die, thus losing the ability to fertilize. If you want to get pregnant within a short period of time, you need to calculate the ovulation period according to the woman’s menstrual cycle, or you can also determine the size of the follicles according to the results of the vaginal ultrasound, so as to indirectly know when ovulation will occur, or you can also use ovulation test strips in combination to accurately find the ovulation period, when the chances of getting pregnant during sex are higher.