One week is 7 days, while 5 weeks of pregnancy means that the pregnancy lasts for 35 days. Usually, women with regular menstruation can calculate the number of weeks of pregnancy by dividing the total number of days of pregnancy from the first day of the last menstrual period to the present, and then dividing it by 7. Therefore, 5 weeks of pregnancy is the early stage of pregnancy. It is recommended to wait for about 5-7 days before going to the hospital for an ultrasound examination to determine the presence of a gestational sac in the uterine cavity and to rule out ectopic pregnancy by a professional doctor. If the pregnancy needs to be terminated, it is recommended to wait around 42 days, i.e. around 6-7 weeks of pregnancy, if possible, to have a medical abortion or an abortion. At 5 weeks of pregnancy, the embryo is very sensitive to external toxic, harmful or radioactive substances. Pregnant women need to take care to avoid as much as possible viral infections, such as colds, exposure to radiation and toxic and harmful substances and drugs.