Any one been ttc for 2 years

Just don't know what to do any more been ttc for 2 years now tracking using opks had positives but no baby yet this way my first mth using soft cups been using preseed for about 6 mths now baby danced every day and every other day gyn put me o Letrozole this was my second cycle on 2.5 mg nothing I'm at a loss don't know if I can take these bfns any more to heart breaking any one feeling the same or is it just me :((