What happens during the trimesters of pregnancy? A normal, full term pregnancy is 40 weeks, and can range from anywhere to 37-42 weeks, and its divided into three trimesters. Each trimester lasts between 12 and 14 weeks, or about three months. Each trimester comes with its own hormonal and physiological changes. If you know and understand of the ways that your growing baby will be affecting your body will help you to better prepare yourself for these changes as they happen. Its also helpful to be aware of the specific risk factors for each three trimesters. First trimester, the pregnancy date counting starts of within the first day of your last normal menstruation cycle. The first trimester lasts from the first through the 13th week of the
