Welcome Winnie and Ryder! Sorry to hear about MCs Ryder... Unfortunately many of us here have also this sad experience.
The good news is that on here you are still young! So you have a better chance than those of us in our mid forties! 
Amanda I'm already taking Vitex, although admittedly not as religiously as I used to. It certainly seemed to settle my cycle back to 28 days last summer, and indeed I got pregnant at that point (for newbies, I sadly had mc in September). Since then, however, Vitex has not had the same impact, and I've become a little more careless in when I take it.
Can anyone remember, was lengthening your cycle one of the potential benefits of DHEA?
I think it might be my ovulation that is getting earlier (and according to clearblue I am still ovulating each month) rather than my luteal phase shortening.
Speaking of ovulation, which is more reliable, temping (which I hate because I am rubbish at remembering) or opk?
Bloop and others who have had bad experience with GPs (autocorrect changed 'gps' to 'god' there, how ironic!!), you have my full sympathy. I think the difference in attitudes of different gps towards older women who are ttc is alarming. It can be the difference between a successful pregnancy and none at all. Sometimes support and enabling a few tests is enough to make a difference. My GPs have been mostly completely disinterested in me telling them I've had problems. They just look at my age (since I turned 40, not to mind now!!!) and raise a quizzical eyebrow. It has completely put me off asking them for help.
I agree that women with no children deserve help over me, and I wouldn't want to take up resources that should be spent on them. So when doctors look sceptically unsympathetically at me I kind of feel too awkward to push the matter. A little bit of empathy, however, and a sympathetic conversation about what I should think about having looked at (albeit at a private clinic) would have been really helpful over the last few years.
Last year I pushed one of our GP's for progesterone tests when I was pg and she refused, saying there was no point because they wouldn't do anything if the tests came back low. She was wrong - I should have been tested and indeed because I've hypothyroidism, NICE guidelines say blood tests should have been given immediately. I still kick myself for not making more of a fuss about that at the time and insisting. What if extra thyroxine or progesterone supplements were all that was needed to make that pregnancy viable?
GPs can be very ageist towards us ladies in our forties who are ttc - it makes me really angry. 
Sorry... Rant over... 
ababs - peri menopause or not, I'd love to be 'caught out'!!!
I'm so fed up with all of this trying, and it's really been getting me down. Unfortunately, I know a lot of people with newborns or who are heavily pregnant. It doesn't help! Thinking of Jass is the only thing keeping me going right now!