Ugh, I totally understand your frustration. Its so hard to not know what is going on and sometimes wishing you'd find a problem so you would at least know what to try. I'm glad you're seeing an RE because my GYNs were totally crap and wasted a lot of my time (though at least laid some groundwork for the RE to get fast results with me).
The vitex did nothing for me at all. I seemed to be on a lower dose than some of the girls I know who took it though so that might have been part of the issue. I only took it when I was not on the clomid, so it might have also needed some time to work.
The vitamin B didn't do anything for me at all really from what I could tell (other than the fun neon pee
). And later on I found some girls who noticed that their temps were all over the place only when taking the vitamin so I do wonder if its partly why my temps were pretty erratic compared to other people and even compared to my first round of clomid where it was pretty obvious... my acupuncturist always gave me a hard time about my 'sawtooth' pattern and was trying to correct it.
I say that the natural supplements did nothing for me because I had my progesteroin checked during those attempts and it was in the 6s... when I got on the higher dose of clomid, I got my first that was over a 10 and got pregnant so the connection for me and my issue seems crystal clear.
Acupuncture didn't have a direct effect on my progesterone issue, but it did WONDERS for my stress levels with TTC... it was not only the benefits of acupuncture, but it was also talk-therapy for me (I love my acupuncturist and poured out all my stresses/worries to her), plus I got a foot rub too!
From what I saw when I was doing my research, there were 3 possible progesterone issues... 1) progesterone not getting high enough in the first place, 2) progesterone getting high enough but falling too fast, 3) lining not adequately responding to progesterone and preparing right for implantation.
#1 was my issue, often easily fixed with clomid
#2 is harder to detect but progesterone suppositories might help... the test for that would be to check your progesterone at 5,7, and 9 dpo... but many doctors don't think its really worth it since there is still a decent window for implantation
#3 is not really treatable... the test is not considered very accurate and not commonly done anymore
I never tried the skin creams because what I read about them didn't make them sound very strong/reliable to me, I pushed for the 'good stuff'
In my case, the 2 factors that really helped me were getting my progesterone high enough (clomid helped with that by giving me a bigger egg than we think I was getting normally) and having the HSG done (you get a 3 month boost in fertility after having it done since it can help flush out your tubes if they're not easy to navigate - which if late implantation/dropping progesterone is part of your problem, it could help the egg get down to the uterus sooner so it can implant before your corpus luteum dies off).
I would definitely ask your RE what he thinks about progesterone suppositories in your case and hear what he has to say and what his reasons against it would be - they really don't do any harm and are quite cheap so it might be a good addition to a treatment plan but have him explain his reasoning against them if he doesn't want to use them on you. I can tell you that using them DID prevent me from spotting but there is an added frustration with them.... that they tell you to take a test at 14dpo and if its negative to stop the suppositories so you can have a period. But every story about someone who didn't get their BFP until 18dpo runs through your head and you worry about stopping them in case you just implanted late. Just a heads-up on that fun little aspect.
Also, once you start them, you have to keep them up during the whole first trimester... so its a hassle that would be worth avoiding if you don't need them, but I understand the anxiety about losing a pregnancy that took you so long to achieve so that may not be something you would mind putting up with for the reward.
Hope some of that info helped. Best of luck and I'm happy to help ANY way I can... TTC is the worst when its not as easy as they told us in sex ed class... I still feel the urge to kick women in the ovaries who complain about how it took them 2 cycles to get pregnant and think that was a huge hardship
(PS, thanks for the congrats... I hope I never ever forget how hard it was emotionally to get to this place... I never want to forget and lose my compassion for fertility struggles now that I'm on the other side of the issue)
)
If I don't fall pregnant this month that I am going to call my doc and have the progesterone test done. I have been pregnant 3 other times and fell pregnant on the 2nd month all 3 times. This go around I don't seem to have much luck, I know 4 months of ttc isn't long but its not normal for me so I can't help but think something might be wrong.
I know you've probably had enough hearing all this jazz about how much I am a fan of grapefruit juice 
