Second Pregnancy

I got pregnant at 16, had my beautiful daughter at 17. I chose adoption for her. She is now 5 years old, and it's been a long tough journey. I do have a semi-open adoption with her. This August my boyfriend and I found out we were expecting. This pregnancy was not planned (I was on the pill) but once the shock wore off we were very excited. I'm in a much better place now, then I was when I got pregnant at 16. I always had a HUGE fear that I would never be able to get pregnant again, and that My Daughter was my only chance. So this little surprise has really helped the healing process. BUT, now I'm worried about the sex. We find out today actually. I want a girl; I want this little one to be a girl so bad, because now I'm scared I gave up my only girl. The thinking seems irrational to me, but I can't stop! I am so worried that I will be unhappy if we find out this little one is a boy. Has anyone else gone through this? Thanks :)