One year on no baby

I need your help guys we have been trying to get pregnant for a year now and still nothing my periods are not regular so that doesn't help to track my ovulating and my cycle is along cycle and now I am concern I may have a problem every month I do a pregnancy test I always have that disappointing negative result and it upsets me I been to the doctor and had a blood test to check my thyroids and hormone balance and they came back normal please help me people