I don't have any advice on doing IVF. However, I also will be starting IVF in the next cycle or two. So, I just wanted to say good luck with that. With regard to temperatures, my temperatures always remained high...until I stopped taking the progesterone. When I first started taking the suppositories, my lining was checked (around 7 or 8dpo) and my lining had not converted. So, they increased the amount of suppositories I was taking. I haven't had any problems with my lining converting since then.