If you are over 30, definitely go see a reproductive endocrinologist. They can determine what the issue could be. I think under 30 years of age, they like you to try on your own for about a year, but you're pretty close so you probably could make an appointment with an RE.
Sheri
May I ask your age? I am 44 and have a 17mo old (which I got pregnant on the first try). I am trying to conceive again, and have only been trying for the past month. I have had many comments posted that say do not be disappointed if you can't conceive as easily as you did the first time. For my age, I am fully aware that my whole reproductive system is obviously not at its peak, therefore I am realisitic in knowing that it may not happen for me again, or may not happen as soon...Are your periods regular? Did you have any difficulty or surgeries in your first pregnancy? There could be many reasons that you're not becoming pregnant, from not pinpointing ovulation, etc...have you talked to your Dr?