Confused

Any other moms have the doctor tell you your baby is measuring 9 lbs around the 36 week mark or 37 mark.? My belly was measuring on point every month until I started going around 35 weeks then all the sudden it measured @ 36 1/2 weeks so they did another ultrasound and said the baby weighs already 9 lbs 6 oz so they want me have a c section . She said sometimes we are off a bit on the weight and could be a lot of fluid around the baby .. but anyone else have this happen to them?