Normally, your uterus is the size of a lemon. By weeks 14 to 17 of your pregnancy, it’s about the size of a small melon and has risen above the pelvic cavity, making it visible above your waistline. At this point, you’ll probably need to shop for maternity clothes if you haven’t done so already. Early in pregnancy, some women have a “come-and-go” belly. Your belly may feel expanded one day and the next day, after you’ve had a bowel movement, it disappears. This full belly-flat belly phenomenon, while a little unsettling, is normal.