I just wanted to let you know that:
1. Congrats on your new boy!
2. I have been in your situation. When I was pregnant with DS3, I swore up and down that he was a girl. I had horrible acne, was sick the entire 9 months, craved only fruits and veggies.... and at 12 weeks, my doctor told me during an ultrasound that he was 90% sure that I was having my 3rd boy. My husband was deployed at the time, so I called my mom and the minute I heard her voice, I burst into tears. She started laughing and said "It's not so bad! You'll love him just the same!" She was completely right. That little boy has my heart and has me wrapped around his little finger. He brings so much light into my life that I'm not at all sad that he is a boy.
3. I am now expecting our fourth son. I miscarried two weeks before I found out I was pregnant with him and I just believe in my heart that that baby was my daughter. I knew from the very beginning of this pregnancy that he was another boy. All my friends, hubby included, said girl. I stuck to my intuition and even told the ultrasound tech that I knew he was a boy and I didn't need to see. My hubby couldn't wait any longer and was soo disappointed when she said "Yep, you're right!" Luckily, this time around, I wasn't upset about him being a boy. I am sooo excited to meet him.
With all that said, I do long for a daughter. My best friend is pregnant with her first baby and she's having a girl. (She's due a week before my miscarried baby would have been due) You are not alone in feeling sad and go ahead and grieve that you're not having a girl. I just keep thinking that when we go to have grandchildren, they probably will be ALL girls and I won't know what to do with myself.
Hang in there!