18 week belly.. or lack thereof

I'm 18+5 and carrying my first baby. I've always carried weight in my stomach with this big roll at the bottom. I'm scared it's going to prevent me from getting a cute round belly and I'll always have this hanging at the bottom. Anyone else have this and went on to round out? Sorry for the unbuttoned shorts - although I haven't gained and my belly hasn't changed on the bottom(mostly rounded out up top) my pants are harder to button