In the 4th week of pregnancy, the embryo continues to develop rapidly, and some symptoms may appear in the expectant mother. Here are some significant developments that occur during the 4th week of pregnancy:

1. Embryo Development: The embryo continues to grow rapidly, and basic organ systems begin to form. Structures such as the head and spinal cord become more defined.
2. Onset of Heartbeat: The embryo’s heartbeat typically begins around this time. However, the heartbeat cannot be heard without an ultrasound examination.
3. Development of the Placenta: The placenta, an organ crucial for the baby’s nutrition and oxygen supply, continues to grow. It embeds more deeply into the lining of the uterus.
4. Pregnancy Symptoms: Some women may experience mild symptoms such as nausea, breast tenderness, or dizziness during this early stage of pregnancy. However, every woman is different, and symptoms can vary from person to person.
5. Pregnancy Test: Many women prefer to confirm their pregnancy by taking a pregnancy test during the 4th week of pregnancy. Home pregnancy tests can typically detect the pregnancy hormone hCG (human chorionic gonadotropin).
6. Doctor’s Visit: During this early stage of pregnancy, expectant mothers often start visiting their doctor. The doctor may conduct an initial examination to confirm the pregnancy and provide essential information about the pregnancy.

The 4th week of pregnancy is a critical period for the development of the baby’s vital organs. Expectant mothers should continue to seek regular medical check-ups for a healthy pregnancy.