The formula is simple: the pregnancy period is counted from the first day of the last menstruation. For example, on May 5 a woman started her period, and on June 20 she comes to the doctor due to a two-week delay. The doctor conducts an examination, after which he confirms the pregnancy. This is indicated by an enlarged uterus, changes in the mucous membrane of the vagina and cervix. Also, at the first appointment with the gynecologist, you can determine the period. As a rule, this is 4-5 weeks.