Hey Nicole Welcome to BellyBelly.

Lots of things here so I will start with what pops first in mind!

Gender of baby - If the person doing your ultrasound decided you were having a girl simply because there was no penis, then that is not an accurate way to distinguish gender. It may be a girl, sure, but if they haven't been able to find evidence of a girl either, then I wouldn't take their word as gospel. Was the person a general ultrasound person or do they specialise in Ob / Gyn issues? Because sometimes someone with a bit more experience in pregnancy scanning can give you a more accurate answer. There are plenty of girls in here though who have had innaccurate gender scans and some that know of people who have had them, so I never take the ultrasound scan as 100% unless I have seen it for myself! LOL

Size of baby - Again, it really takes a well trained eye to give you a good estimate. I have heard of some really bad estimates too, like people being told they are having huge babies like yourself and they get all worried, yet they have tiny babies or are induced only to find they have small babies - very sad. Janet Balaskas, author of active birth and founder of the active birth movement, birthed a 10lb baby without tearing, by birthing upright, with the aid of gravity. So check out some active birth information (there is some on the main site here which will help give you confidence in your own body. Remember, ultrasound can be innacurate at the best of times, it's all calculated with mathematics and statistics, where especially late in pregnancy, your baby is growing based on his / her own genes - not averages.

About the nerves: Fear or stress produces adrenaline. Adrenaline slows or stops the labour hormone, oxytocin. It's great that you are trying to quell your fears, and it's very important that you address them to let this baby come. Flight or fight kicks in, and if your body is not feeling safe, it will not allow baby to come - it's that complex and amazing.

As my birth teacher says... "We can trust we have inner knowledge of the birth process; trust that our babies know the journey; trust we will draw to us those we need for support; trust in the power and flow of birthing energy."

Trust your body. Trust your baby. And most of all, trust your instincts.

All the best for a wonderful birth