ladybeautiful - First off, I didn't find that my temps were exact correlations to progesterone levels, lol.. I got low results on days when my temps were peaking, better results on cycles where I didn't peak as high or even when I had a slight dip in my temps. So I could never find a clear correlation.
I got put on clomid very fast. Though I had to switch doctors to get it. First I was seeing a PA after my Mirena removal. When I had a delayed period she said I might not be ovulating (which started me temping when my period did come on). Then I had a nightmare period and wasn't ovulating and the PA referred me to a GYN. He was totally dismissive tbh... I wasn't having cycles and he told me to wait a few cycles

I was 29 and he told me I was young enough to have 10 kids (ummm if I have 1 a year and have no trouble concieving?!?!). When I started crying he was a little more supportive.
Anyway, the next GYN I saw suggested clomid right away after some blood tests etc.
But I got a little upset with him because he wouldn't up my clomid dose even though my progsesterone was low. So thats when I switched to an FS and feel like I finally got the right attention.
I was put on clomid in January, my Mirena had been removed in Sept (and Mirena is not supposed to have any lingering effect on your fertility ... as soon as its removed you're supposed to be fertile again).
I was also conscious of being one of those 'I read online' patients (in fact, I would LOVE to see what my charts say about me, lol!!!)... BUT, as I discussed with my FS, I trust his judgement and experience, but I need to understand why he wanted to do X, Y or Z instead of what I'd read etc.
I have read that the best way to get a picture of your progesterone is to do a 5,7, and 9 day test... most doctors won't bother with that though, lol! And most would think it was a little crazy. But it makes sense since BBT and OPKs get you CLOSE to detecting the exact day of ovulation, but its not always precise. I was worrying my progesterone might be 'fine' at 7dpo but drop too fast after that (my Feb cycle made me think this... temps plummeted too soon and just hung above my coverline).
There is a method where they can take a sample of your lining at 7dpo or so, but my FS said that its got risks and that they really don't learn anything more from that then other tests.
If you do the HSG, keep in mind its actually one of the few tests that BOOSTS your fertility for 3 months afterwards! (it can clear minor blockages and dilate your tubes)
Doing a sperm test early on also helps because you can tell in 1 test if the guy is ok. My husband's was super cheap too... like crazy cheap ($25 without insurance!!!).
5 months isn't too long in the grand scheme of things, but I remember what it felt like at that time and honestly its about the most intense time emotionally... like getting pregnant before 6 months felt SO important to me. The good news is that it didn't get worse in the following months... it was hard in different ways, but the anxiousness didn't get worse.