Not feeling a connection

We found out last week that we are expecting a baby boy. My husband and I were both wanting a girl and I was so sure the baby was a girl. Now that I know, I still find myself imagining the baby as a girl. I’m having trouble re-gaining a connection with the baby. I guess maybe because I spent almost 4 months thinking he was a girl. Has anyone else experienced something similar? Any advice? I know “gender disappointment” is a thing, but this feels different...I don’t feel disappointed I feel different.