You can’t get pregnant if you have sex once in a while during menstruation, because during menstruation you are in the follicular phase, where there are no dominant follicles and no ovulation, so you can’t get pregnant if you have sex at this time. However, it is not recommended to have sex during the menstrual period, because sex during the menstrual period may lead to the invasion of pathogenic bacteria and cause pelvic inflammation, endometrial inflammation, cervical inflammation, etc., which will have a great impact on the physical and mental health of women, so do not have sex during the menstrual period. In addition, coitus during menstruation may also lead to endometriosis and cause severe dysmenorrhea in the future, leading to infertility and bringing great confusion to life. Therefore, it is recommended to keep the vulva clean, change sanitary napkins and take better care of the vulva during menstruation so that the menstruation period can be passed peacefully.