Generally, the weeks of pregnancy are counted from the date of the last menstrual period, that is, from the beginning of the cycle in which fertilization and implantation of the embryo will occur.
Therefore, the first week of pregnancy corresponds to the week of menstruation and conception has not yet occurred.
Read the full article on: The first month of pregnancy: initial symptoms and maternal care ( 79).
By Blanca Paraíso M.D., Ph.D., M.Sc. (gynecologist), Carmen Ochoa Marieta M.D., Ph.D., M.Sc. (gynecologist), Daniel Sosa M.D., M.Sc. (gynecologist), Silvia Azaña Gutiérrez B.Sc., M.Sc. (embryologist), Zaira Salvador B.Sc., M.Sc. (embryologist), Michelle Lorraine Embleton B.Sc. Ph.D. (biochemist) and Cristina Algarra Goosman B.Sc., M.Sc. (psychologist).
Last Update: 02/02/2022