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This guide explores early embryonic development, focusing on bilaminar germ disc formation, implantation dynamics, trophoblast differentiation, uteroplacental circulation, and primary villi formation. It delves into embryonic cavity and secondary yolk sac formation, and examines abnormal implantation sites like ectopic pregnancies and placenta previa. Clinical insights cover hydatidiform mole and diagnostic significance of hCG levels, alongside developmental processes and their chronological...