Gender Disappointment

I’m pregnant and FTM. I just found out I’m having a boy and I can’t help but feel this overwhelming feeling of sadness. I have a one year old niece and seeing how close she is to my sister, it makes me sad feeling that I won’t have that with my boy. I know of course it’s silly and that I will love my son no matter what but I’m still so sad. I’m hoping that the woman at the ultrasound got it wrong. I have my 20week anatomy in a few weeks. Has anyone felt like this? When does this feeling subside? I guess also I’m such a daddy’s girl. My father is my entire life and world and I was hoping my husband can share that with a baby girl too.