If you were my patient, I would advise going to see your doctor for a check up and health maintenance evaluation. He/she could then update everything for you -- depending upon your age -- you might need a pap, STI screening, Gardisil vaccine, etc.
Once your doctor has gotten you up to date, he/she can advise you whether there are any tests indicated to evaluate you for infertility, or whether you just need to try a bit longer.
One thing you can do on your own is start using ovulation predictors (near pregnancy tests in the drug store) to help with timing of intercourse.
Hope this helps!