My husband is also 獨子 and my baby is a girl. But both my husband and his family loves our BB so much wow. They both said baby girl is much more lovely and less naughty than baby boy tim.
No matter my first child is boy or girl, I would also give birth to our second child. Even the second child is also a girl, so what? You can then have two son-in-law when they grows up law.
My target is having 2 or 3 children, no matter their gender. I think the number of children shall depend on many factors, e.g. if you have sufficient time, money, sufficient people to take care of them..., rather than the gender of first child. The concept "係仔係女都無所謂" should always be kept in mind. The most important thing is that they are your babies.
When you see your daughter's smile or when she kisses you, I think your mind would change.