Hey I'm 19 years old I had a child when I was 14 and now I'm 19 I been trying to get pregnant again but I can not get pregnant we have been trying for 3 years now and I want to know is there something wrong with me

We can't possibly know if there is something wrong, nothing wrong, something wrong with him, or what. Finding out why a woman can't get pregnant takes some expensive testing.

You might want to get your medical records from when you gave birth at 14. How was that handled?

No

Sometimes you can try for years months weeks or days, when the time is right the time is right... you can research several ways to help get yourself pregnant... try some of those if not try going to a fertility dr because something might not be right