title: Very early pregnancy.
authors.affiliation: Obstetrics, Gynecology and Reproductive Sciences, College of Medicine, University of Saskatchewan.
authors.forename: Roger
authors.initials: R
authors.lastname: Pierson
mesh_terms: D000328:Adult; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal