Big baby?

Mariah
Anyone told they are having a "big baby" based off of an ultrasound and given the option for a c-section? I am 40W5D and OB is saying my baby is estimated to be 10.4lb, give or take a pound. I really wanted to try for a natural birth so I'm not quick to agree to a c-section. Also, I heard a lot of ppl are told their babies weight by ultrasound and it ended up be way off (usually lower). Anyone going through this or went through this? Would love to hear your thoughts. Also, I don't have GD.