Final answer:
The first sign of pregnancy is usually a missed menstrual period, confirmed by a positive pregnancy test. Other early signs can include increased fatigue.
Step-by-step explanation:
The first sign of pregnancy is usually a missed menstrual period. When a woman becomes pregnant, her menstrual cycle stops because the fertilized egg implants itself in the uterus, and the body starts producing hormones to support the pregnancy. However, it's important to note that a positive pregnancy test is the most definitive confirmation of pregnancy. Other early signs can include increased fatigue due to hormonal changes in the body.
Learn more about pregnancy