Success after HSG? Positive thinking?

We've been ttc since 2007 (now 1/1/11) without any luck. I just had the HSG 3 days ago, and am hoping this month we get our BFP so that I won't have to start fsh injections next month. Anyway, they tell me we have unexplained infertility. I'm trying not to stress out, over-think baby thoughts, and to not be so sad when I have to tell my husband AF just came to town for her week long monthly visit. I'm 30, and more than half my friends have had to go all the way through 3 or 4 rounds of IVF. So, to those of you who have had success, do you think positive thoughts all the time? Is that the secret? How much of this is psychological? thanks :)