It is completely normal for your belly button to undergo changes during pregnancy, including as early as 7 weeks. The most common change is the transformation from an innie to an outie due to the growing uterus putting pressure on the abdominal wall. This can cause the belly button to protrude outward. Hormonal changes and increased blood flow can also contribute to these changes. However, if you experience any pain, redness, or discharge from your belly button, it's important to consult with your healthcare provider as these could be signs of infection or other complications.