Hi Bean - lovely to meet you. I suspect you're the first person who I'll have discussed my DH's sperm with in the first 'meeting' 

I'm nipping in from the grads thread, but have read your earlier post. I would say re your dh's sperm it can't hurt to take a conception vitamin for him. We have ds who is 3 now. We got pg with him the third month of trying. Prior to that we'd got pg the second mth of trying but sadly had a m/c. So we weren't really anticipating any delays this time round. We started ttc no 2 when ds was 15 mths and it took us 19 mths!
Now, after a year we were referred to the fertility clinic, with the 'standard' tests. My blood tests came back ok but dh's SA showed reduced motility (whereas I assume there were no issue before? We'll never know as he wasn't checked before). Anyway, in due course the fertility clinic did a repeat SA for DH, which was about 3 mths after the first. During this time he had given up pepsi and started taking wellman conception (already didn't smoke at all, or drink v much). And his second SA was normal.
At the sane time as that the fertility clinic sent me for a HSG which didn't show any probs but you never really know if has cleared a bit of muck out.
We got pg the month after the HSG, but also within 3 mths of dh's improved SA.
Now we'll never know what the real cause was. Maybe it was the sperm, or a blockage subsequently cleared by the HSG, or a combination of both. Or maybe his first SA was just 'unlucky' as they often say you can't rely on one sample, and there wasn't really a problem there in the first place?
So quite possibly for your DH there won't be a problem, but I think it can't harm to try a male conception vit to give everything a helping hand if it is taking longer than expected.
We used the wellman conception one (well we actually bought the pregnacare his and hers but it's the same thing) but I know lots of people gave looked at just certain components if it and I'm sure someone who who knows more can advise on that.
Hope that helps anyway xx