The namechange was causing a bit of confusion, so here I am, I used to be Hopefulgum and then Hufty, but back to the old me, original name: Gumblossom. Sorry for the confusion!
Grizzer, I have heard that tight clothing can increase the heat of the testicles, therefore affecting sperm production, but there's varying advice on it, some experts say it doesn't make any difference. Would DH be up for a sperm analysis? It might be enough to put your mind at ease.
You know it is probably not the case, and you are probably both fine, but ttc after age 40 can be very slow.
However, in stow's case it was very quick! Congratulations - I hope it is smooth sailing for you.
Squidgy, 8 days late, wow! Those internet cheapies are notorious for not showing positive. It does seem strange if they are supposed to be 10 whotsits (very sensitive). I know I was getting + on FRER and nothing at all on the IC's. So I would say it isn't over til AF arrives. Do you know for sure when you ovulated? If you ovulated later than normal, then you may not actually be late, IYSWIM. But if you are sure of ovulation, then being this late is a great sign. I have my fingers crossed for you.
I have been doing a bit of research (again, I am fucking incurable!) and some of the advice given to older women is that although we are born with a finite number of eggs, so we might be reaching the end in our forties and the quality may not be great, some doctors and health experts believe that it takes 90 days for an egg to "ripen" and in that time you can make a big difference to the health of the egg. One of the biggest problems as we get older is the lack of blood flow to the uterus and ovaries, so we can improve that through exercise, acupuncture, massage and taking daily baby aspirin.
It is also suggested that as we age we need higher doses of different vitamins and minerals, particularly: vitamin D, folic acid (about 10 times the recommended amount!), and of course there are many suggested alternative supplements like royal jelly, vitex, maca, DHEA and Coq10. The big IVF clinics in the US prescribe Coq10 to their patients, so I guess there may be something in it.
So,after checking the charts of over 46 year olds on fertility friend, and finding pregnancy charts of 48,50 and 53 year olds (who, incidentally were not on ivf), it seems I have renewed vigour with ttc.
I think the bfp has made me realise that it can actually happen, that it is possible that I have a good egg in there, or at least one I might be able to cultivate.
I also read that in experiments with other mammals (I guess that means rats) a lower calorie diet has a positive effect on lengthening fertility - I wonder if doing the fast diet helped in any way? I know there have been a few bfp's on that thread.But I am guessing there would be anyway. The fast days are supposed to give the body a chance to renew cells and has a rejuvenating effect (apparently) so perhaps it can make a difference.
So, I'm shoveling in the supplements again. Maybe there is going to be one good egg. Maybe not, at least I'll give it another go. I just don't want to be on this thread in 5 years time 
And I am pretty sure I won't be....