It is normal for your period to come once every 35 days. A normal menstrual cycle is 21-35 days. It is normal to have your period 7 days early and 7 days late, so it is not necessary to worry about having your period once every 35 days. During menstruation, you should pay attention to rest, do not work hard and stay up late, keep your vulva hygienic, and do not eat cold food. Married women should not have sex when they are menstruating. Having sex when they are menstruating may cause bacterial infection and inflammation of the endometrium or pelvic cavity, and may cause backflow of menstrual blood. This means that menstrual blood can enter the abdominal cavity with the fallopian tubes, causing endometriosis, which can have a significant impact on future pregnancies.