If you are a nut then so am I. I know exactly how you feel as I am the same.
I have 5 boys and was told at my 20wk u/s this one is a girl(99.9%) but I won't believe it until I see with my own eyes there are no little boy bits.
I have bought a few pink things for the baby but I won't take them into the hospital with me or take the tags off and wash them incase I have to return them and exchange them for blue.I know lots of women having babies around the same time as me so I will probably just give them away if I have to.
I have a feeling it is a girl but we will just have to wait and see.
I will for us that it turns out the way we hope.
All the best
Michelle