been trying religiously, and very hard, for over 2 years now, in all that time, i have only 'caught' once at the end of march, but it ended in an MMC in may (blighted ovum)
i take so many supplements, i rattle as i walk, ive lost weight, stopped drinking, have sex when i should,...pretty much like all of you, but time is ticking on...im 44 now and my youngest is 5 (this has been a very much planned and wanted pregnancy as a sibling for my youngest, that was near to his age, as the next one up is 12, but at this rate, it will be the same or a larger age gap!!)
hubbys sperm had been tested and is just over borderline low, so nothing can/will be done unless we pay for it, which isnt an option....my age and the fact i already have children also precludes me from any fertility treatment on the NHS - quite rightly so, as I know im extremely lucky to have the 5 i do have, but i always wanted 6, and just feel that my family isnt complete yet)
my heart goes out for hubby, because not only does he feel emasculated, he also feels so bad that he cant give me the one thing my heart desires.
in our more desperate moments, we have even discussed finding a 'friend with benefits' that would agree to help. 
MrsP you could be right, Im thinking of giving it till christmas, then laying off the temping, all of the supplements (except folic acid) and deleting my fertility friend and period tracker apps and just forgetting all about it....well as much as my symptom spotting habit (imagination) will allow LOL