I was convinced I was going to have a hard time getting pregnant - horror stories from my mom and too much time in the MDC TTC forum.
I was charting obsessively and just about drove DH crazy.
No luck the first month - he told me to CHILL OUT, so I did, and there you go - second month was the big winner.
I really thing stressing over it had something to do with not getting pregnant the first month... so, my advice: Just go with the flow! It's more fun that way anyway.