The first trimester of pregnancy is the earliest phase of pregnancy, lasting from week 1 through approximately the end of week 13 of pregnancy, or about months 1 to 3. During this time, your body undergoes many changes as it prepares to support the growth and development of your baby. Here are some things you can expect during the first trimester:

• Physical changes: You may experience a range of physical changes, including breast tenderness, fatigue, nausea, vomiting, frequent urination, and constipation. Your uterus will also begin to expand, and you may notice some mild cramping or spotting.

• Emotional changes: You may experience mood swings, anxiety, and excitement as you adjust to the idea of being pregnant. It can be helpful to talk to your partner, friends, or healthcare provider about your feelings.

• Prenatal care: During your first trimester, you will have your first prenatal visit, which will include a physical exam, blood tests, and an ultrasound to assess the health of you and your baby. Your healthcare provider will also discuss your medical history, provide guidance on nutrition and exercise, and answer any questions you may have.

• Fetal development: By the end of the first trimester, your babys major organs and systems will have formed, and the fetus will be about 3 inches long. You may be able to hear your babys heartbeat during an ultrasound or Doppler exam.

• Genetic testing: You may be offered genetic screening tests during the first trimester to assess your babys risk of certain genetic conditions.

• Weight gain: During the first trimester, you should gain about 3-6 pounds, depending on your pre-pregnancy weight. Its important to eat a healthy, balanced diet and stay active to support your babys growth and development.

Overall, the first trimester can be an exciting and challenging time as you adjust to the physical and emotional changes of pregnancy. Its important to take care of yourself and seek medical care if you have any concerns or questions.