I'm 33 weeks and baby's weight?

I had an ultrasound done today and baby is 3lbs and 10oz putting her on the 12th percentile. Ain't that a tad small. I had an ultrasound 4 weeks ago and the baby gained a lb since then. Meanwhile I haven't put on any. I've heard that fundal measurements are also bigger when babies are in in breech position. Mines is breech but i'm still measuring small based on that. At this rate, I wonder what she will weight at birth