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    When Does the Second Trimester Start During Pregnancy?

    Understanding the Three Trimesters of Pregnancy Pregnancy is divided into three trimesters, each with its own set of physical and emotional changes. The first trimester starts on the first day of the woman’s last menstrual period and lasts until the end of week 12. During this time, the fertilized egg implants into the uterus and begins to develop into an…

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