How long?

I went off birth control last January. It is now November and we have still had no luck conceiving. We actively started trying in June, meaning I started using ovulation tests and really tracking my cycle; the tests say I'm ovulating each month and we have sex during those times. Honestly it is getting frustrating. We both want this to happen and each month we grow more disappointed. How long should we TTC before make sure nothing is wrong? We are coming up on a year of trying so I'm thinking we may need to see a doctor just to be sure pregnancy is an option for us. Any advice would be appreciated.