I had to take 200mg before I noticed much of a difference in my LP, so you may want to up the dose. As for the progesterone cream, unfortunately, the over the counter stuff did nothing for me. There just wasn't a high enough concentration of progesterone in it. I don't know what to tell you about your thyroid, but it's perfectly okay to get a second opinion. Maybe even from somebody who will draw your progesterone
As for your BD timing, I'd actually suggest trying to BD less. Too much BDing during your fertile phase can dry out your CM and change the PH. It can also lower his sperm count, so since you haven't had success with every day, you may want to try every other day. My DH and I tried DTD less this month, and I'm hoping that less was more for us