I feel terrible

I’m 13 weeks 1 day and just found out I’m having a boy through blood work, and I never thought I would feel like this, but I’m battling gender disappointment or however you say it.. I really wanted a girl and was convinced it was a baby girl... I know I should be thankful that my baby is healthy but I can’t get it out of my head that I wanted a little girl... I feel terrible because I want to connect and be the best mom I can be but I’m scared he can feel that I’m disappointed..