Expected birth weight around 9lb

Hi, was just wondering if peoples estimated baby weights from growth scans were accurate? I’m 33+2 and estimated weight at the minute is 5lb1 with estimated birth weight currently at around 9 pound. I’m really worried as my other 2 were only 5 and 6 pound and I’m very small! Can someone reassure me that a 9lb baby and a possible natural birth isn’t that scary? Lol tia x