When the bump appears

Just curious- with my First baby, when should I expect my bump to pop? I don't have super flat stomach but I'm not too chunky either. Not exactly sure of how far along I am. Somewhere between 3 and 6 weeks. I am thinking close to 4 weeks but my hcg level must be high because that line appeared quickly and very defined on both tests! First appt w sonogram on July 1 so I'm excited to get a more accurate sizing.