Measuring ahead for fundal height.

M

Has anyone had their fundal height measured 4 weeks ahead and baby was actually big? And had their baby earlier than their due date? I was told my fundal height was measuring at 33cm and I’m 29 weeks. Might have to get an ultrasound to measure him if I keep getting bigger. No GD as well and I’ve only gained 18 pounds so far. He did look very chunky in the 3D ultrasound we had at 28 weeks.