Pregnancy week by week First trimester - Mayo Clinic
https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/basics/first-trimester/hlv-20049471
WEBNov 4, 2022 · During the first trimester, physical changes may include breast tenderness, fatigue and nausea. Emotions might range from excitement to anxiety. For the fetus, the first trimester is a time of rapid growth and development. The brain, spinal cord and other organs are forming. The heart begins to beat.
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