i know this might sound sarky, for which I apologise, as it's obviously a serious matter to you, but have you considered not trying? I've known several people who got fed up with bo*king at the 'right' time, and all that malarky and just decided they were going to let nature take its course. Hey, presto! Pregnant.
Whilst you continue to put yourself under pressure to conceive, you're not giving your body the chance to do things for itself. Just um, how can I put this delicately............lie back and enjoy it! Good luck!