Rightup have you tried ovulation tests and / or charting to confirm when you ovulate, or indeed that you are ovulating? Do you have regular cycles? As the other poster said (sorry, can't remember name
) it could be a matter of timing? Although if you're doing every other day maybe you'd be ok?
Sorry if you're doing all this stuff, but I know what you mean that going for tests just seems so serious etc.
We had ds reasonably easily, but were trying for dc2 for well over a year before anything happened. we did go for tests after a year (I was very worried - probably too much so - about the age gap with ds so didn't want to delay any more). The first sa for dh showed low motility so he started taking male conception vits, and he gave up drinking Pepsi (he already didn't really drink and had never smoked). The second SA 3 mths later was 'normal' which could have been coincidence or a genuine improvement. My blood tests showed nothing untoward but the fertility clinic did a HSG anyway as a fairly routine test and we got pg the cycle after that, so maybe that cleared a blockage or some sludge? Either way I'm currently 24 weeks pg but I do totally understand having the 'ump with it all. You could try the male conception vits sort of thing without any tests though - just but then in boots?
And sorry if you're reading that thinking 'err yes, I'm already doing that!' 
As beangrower says there are lots of lovely threads on here for hand holding and commiserating. I've found the brooking threads to be very lovely with a positive outlook, and indeed got my bfp the first cycle I was on there so maybe.... (can't link as an on my iPad but I'm sure you'd be v welcome
)