It's also worth mentioning that you're never looking at just one hormone on it's own - it's about balance, and you need to have enough oestrogen in your system to balance the progesterone or you won't be able to tolerate it. So is it possible that your oestrogen level has been increasing at the same time, so you now have a better balance between the two? I've certainly found that getting my oestrogen up to an optimum level has enabled me to tolerate utrogestan better than i did initially, still not enough to take it continuously or at a 200mg dose, but better than when my oestrogen was at rock bottom.