profwife - I recognize that this is totally unsolicited advice, so tell me to kick rocks if you want. Both times I've gotten prego now, I bd'd daily the 3 days leading up to a positive Ov test, but
not the day
of the positive test or the day after. So all that just to say, at least for me - getting lots of bd in several days
before my positive Ov test seemed much more effective than bd'ing on positive test day or the day after (and I'd had plenty of months where we only bd'd on positive test day and 1 day after, etc). Or, conversely - have you looked into SMEP? I know you've been trying awhile, so like I say, tell me to go away if you like

but this was helpful advice that I got from another board that worked for me!
One other thing I learned this go-round: I read a study of women who were undergoing IUI. It determined that these women were 50% more likely to become pregnant if they stayed laying down for 15-30 min after insemination than if they got up, got dressed and left right after. Again, this might be old news to others, but I always thought that laying down for a while after sex to improve chances was just some old wive's tale. I imagine that if it worked for iui it'd also work for the old fashioned way!