Just had baby after 9 years of trying and I want another one!

Mindy
Hello everyone, I had my son when I was 18 and tried for another a year after with no success. I gave birth to a baby girl 3 months ago and I want to try for another one right away. My doctors and I are not sure why it took so long to conceive other than irregular cycles and cysts on ovaries. 
​Has anyone had this problem with conceiving? I wanted a somewhat big family but I don't see that happening because it took 10 years for me to have another child.  Please Help!!!