What are the most common early signs and symptoms of pregnancy?
Common symptoms of pregnancy such as mood swings, nausea, and weight gain can be caused by elevated levels of hormones like estrogen and progesterone. These hormone changes happen because the mother's body is preparing for childbirth. Estrogen and progesterone levels both increase during pregnancy due to placenta production (increasing during the first 12 weeks) and maternal tissue growth (increasing after 12 weeks).
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