I agree with mander, get a copy of TCOYF, when dh saw me reading it he asked questions as to what it can really teach me, the last week my temps have been raised and he got really excited about it, now im sure he wouldnt have got excited if i hadnt of told him that it could be because i was pregnant and i would never have known about it if i hadnt got the book!
Af arrived and i told dh that my temps had dropped, he automatically said 'well that means af is on the way then' It has taken him nearly a year to get this involved with it all and it has taken a lot of patience from me and some carefull treading - believe me!!!
All i can say is it is a touchey subject and needs to be approached with some care, tell dh how you feel and how it makes you feel when he doesnt get involved or doesnt want to talk, its alot of pressure for both of you so try and work together.
I wish you all the luck