Am I the only one not getting a growth scan?!

Jessica • Mom of 2 boys, 1 girl🧒🏼👦🏼👦🏼26 years young. Engaged💝💍

My last ultrasound was at 18 weeks. Im measuring 4.5 weeks ahead based on fundal height yet my doctor won’t do a scan. My last baby was just shy of 10 pounds born at 38 weeks. Im worries this one is going to be even bigger.