I'd agree with the above statements. Just because you get a positive OPK doesn't mean that you ovulated or released an egg. If you've been trying for at least a year I would go to the OB to be on the safe side. You just may need more time. Good luck!
I agree with Stacy! Just keep using them. You could see a doctor after a year of ttc on your own for more assistance. This is usually the first steps in ttc. Best of luck!
you just have to keep trying and using opk's, every month there is only a 20% chance of getting pregnant at peak fertility age, if your older, say after the age of 40 it goes down to 5% each month, I have been using opk's for the last 6 months and still havent gotten pregnant, so as I said its just a case of keeping on using them and trying :) good luck