You will definitely have to get tests done before you would be referred for IVF because they would have to try and find a reason that you're not getting pregnant.
If you aren't O'ing then it could be something as simple as clomid. If you have endo, ashermans or uterus problems then they will want to fix those as the chance of acheiving any kind of pregnancy with or without IVF wouldn't be good. If DH's sperm is the problem they have to find out what area is the prob. Seperating the good from the bad sperm might see you escaping IVF and doing IUI or AI instead.
There are so many different reasons why something isn't getting pregnant that the list really is too long to write!
I know that the period of testing is long and often drawn out before you get on the road to treatment, but you just have to hang out and wait, and know by doing that, that you're doing the best thing to help achieve a pregnancy in the end.
Best of luck to you.