Hi Angelfish
I have also been told stress is a factor, but I think we ladies have to be really careful not to beat ourselves up about this. Sometimes the way articles are written and advice is framed, it's as if it's our fault we aren't conceiving. It so, so isn't.
That being said, stress is a horrible thing for so many reasons. I was promoted in January 2008 to a very, very stressful position, and it made me very stressed - sleepless nights and spontaneous tears most evenings. In March 2009 (nearly a year of unsuccessful TTC and one MC later) I went to my boss and asked to change roles. I have been very lucky that I could do this, and it has made me feel a lot better to know I am in a role I am doing well and one I can juggle with hospital appointments for treatment. It is still challenging and stressful at times, but I'm no longer managing a team of 20 which was proving very hard work.
My favourite ways to relieve stress are yoga (once a week) and I also use a relaxtion/hypnotherapy CD. One of the great things about the CD is it encourages positive visualisations, so it's a great excuse to switch everything off and fantastise about holding my baby - and because a professional is telling me to do it, it officially does not count as obsessing!! Yay!
I also go to reflexology once a month, which I love. Not sure it particularly helps me OV etc (I'm pumped full of IUI drugs at the moment anyway so it makes no difference!!) but my reflexologist is lovely to talk to and I really look forward to the sessions as they are so relaxing.
I also have some geeky (but relaxing) habits like massive jigsaws and knitting. The knitting means that when junior comes along, he/she will have a huge stack of homemade blankets and cardies! (Oh, what a confession)
Good luck
xx