First trimester

By Mayo Clinic Staff

The first few months of pregnancy — the first trimester — are marked by rapid changes.

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. Fingers and toes begin to take shape.

When you find out you're pregnant, make an appointment with your health care provider to begin prenatal care. You'll learn what to expect during the first trimester and beyond.

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Nov. 04, 2022

See also

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  2. Second trimester pregnancy
  3. 3rd trimester pregnancy
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  5. Allergy medications during pregnancy
  6. Ankle swelling during pregnancy
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  8. Antidepressants and pregnancy
  9. Aspirin during pregnancy
  10. Pregnancy back pain
  11. Pregnancy bed rest
  12. Can birth control pills cause birth defects?
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  15. Cervical length
  16. Chickenpox and pregnancy
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  21. Fetal development: The first trimester
  22. Fetal development second trimester
  23. Fetal development: The third trimester
  24. Fetal presentation before birth
  25. Fetal ultrasound
  26. Flu shot in pregnancy
  27. Fundal height and fetal growth
  28. Headaches during pregnancy: What's the best treatment?
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  30. Hemorrhoids during pregnancy
  31. High blood pressure and pregnancy
  32. High-risk pregnancy
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  37. Low amniotic fluid
  38. Medicine concerns during pregnancy
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  46. Pregnancy and obesity
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  48. Pregnancy diet: Essential nutrients
  49. Pregnancy due date calculator
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  54. Pregnant. Now What Happens?
  55. Pregnancy and COVID-19
  56. Prenatal care: 1st trimester
  57. Prenatal care: Second trimester visits
  58. Prenatal care: Third trimester
  59. Prenatal testing
  60. Prenatal vitamins and pregnancy
  61. Rheumatoid arthritis: Does pregnancy affect symptoms?
  62. Sex during pregnancy
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  64. Vaccines during pregnancy
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  67. Working during pregnancy
  68. X-ray during pregnancy
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