Primary and secondary infertility- feeling selfish!

So we were diagnosed with infertility due to PCOS after 4 years of trying. We had a success round of IVF and I now have a beautiful 16 month old little girl 🥰

You hear all the stories don’t you: ‘my auntie was infertile but after a pregnancy she was cured’ blah blah blah. And I was hoping that would be our reality. But after 2 months of hormone monitoring, turns out we are still in the same position as before.

I don’t know how to navigate this now. We yearned for a child and where blessed with a beautiful girl. But then feelings have now come flooding back and I find myself feeling the same as I did back when we were TTC for my first.

Is this normal? Should I not be being so selfish? And just be grateful for the family I do have?