Ultrasound measurements

I'm 36 weeks and my baby is measuring 5 lbs 11 oz. my fundal measurement is 38 weeks. I know ultrasounds can be off by a pound or so, but my question is is it possible that she's even less than the 5 lb 11 oz estimate? (I hope not). I am really hoping she's is in the 6 lb range this week. The reason I'm not sure is because it seems like everyone I see says their estimates were over. Like doc said ten lb baby but was actually 8.