We've been trying for 2 years...

Anna • I`m married to my best friend, he really is my whole world. We have been trying to conceive for 2 years now but no luck.
My husband and I have been trying to get pregnant for 2 years now and nothing has happened. What could be the problem? Infertility? I had a miscarriage still born at 5 months about 4 years ago, could this be it?