Instincts vs Ultrasound at 20 weeks

I had US at 20 weeks, lab tech said it was a girl..

I never had nausea,carrying low,no craving never been sick,my line of nigra goes all the way up my belly button..

I have a strange feeling am carrying a boy..

I really adore baby girls..

But all these 4 months my heart was set to boy..

Am getting depressed.. thinking all weird things

Don’t know what happened to me

Can US be wrong n my instincts right??