Pregnancy Trimester, First |
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| Early Placental Phases; First Pregnancy Trimester; First Pregnancy Trimesters; First Trimester; First Trimester Pregnancies; First Trimester Pregnancy; First Trimesters; Phase, Early Placental; Phases, Early Placental; Placental Phase, Early | |
| The beginning third of a human PREGNANCY, from the first day of the last normal menstrual period (MENSTRUATION) through the completion of 14 weeks (98 days) of gestation. | |