Baby weight estimated by the ultrasound.

Who just had an ultrasound session and was informed about the estimated weight?? I was informed about my baby's weight at 24th week (approximately 556 gr) and 28th week (1,159 kilo). The first time my OB said that my baby is growing really fast and if he keeps doing this he may be too big for me to have a natural birth. Could you please share your estimated baby weight by ultrasound if you were also informed like me?? Thanks to all.