Happened to me around like 13 weeks or so and would come and go.
Belly button pain in pregnancy is a common complaint for many women. Often, pregnant women feel discomfort around their navels as the muscles and skin stretch. Later in pregnancy, the expanding uterus may press on the belly button, causing pain. Women with navels that push outward when they normally go in may have particularly sensitive skin in the area that can become irritated from contact with clothing. In some cases, this type of pain can mean an umbilical hernia, so women should always notify their healthcare provider to determine if treatment may be required.
Yer thats happening to me to, its also very itchy, its just preparing to stretch and poke outward, totally normal