I understand that feeling so well, as we went through the same thing years ago. We wanted kids so very much, but nature didn't let us. Oh my, my jalousy towards pregnant women was immense. The worst was waiting in the waitingroom at my gynaecologist (sp??); I was sitting there in the same room with women in all stades of pregnancy. How much I wanted to kick them.... . Try not to focus to much on getting pregnant. Sometimes it is even good to take distance from it!
We finally decided to adopt. Our kids are now 19 and 15

Good luck to both of you!!