I always wanted at least one girl and one boy and lucked out by having only two kids. My daughter came first then my son two years later. If my son was another girl, I was going to try again for a boy but didn't have to.
After each of my kids I had post pardum depression and it was worse the 2nd time. The doctor warned me against having a third child so that pretty much made up my mind at that time. I actually was around your age when my son was born. After that for a few years I did think about having another child but was too afraid to get pregnant again due to the post pard. Then, before I knew it I hit 35 (now am almost 38) and decided that I felt too old to be up all night for feedings again, and to do all the physical work involved in raising babies. Also my son is now 12 and my daughter 14 and I kinda like this age better. Even though now the work is more mental and can be equally exhausting. But I can't see going through the baby years again, I am just too tired to do it now!
but you are still young. My advice though if you can is not to wait until you are way past 30 only because medical risk will go up after that. But that does still give you a few more years to decide. Lilly