Hi beca my mistake I think rereading your post. Utro builds up in your system the longer you take it. For example, I'm ok for the first few days (about 4), in fact if anything feel a bit sedated, but after that I (personally) don't feel well and hit a wall with it. Mary G has posted on this a lot, it's known as progesterone intolerance and affects about 15% of women (I believe) and I'm one of them. Added to that I also get progesterone withdrawal as it leaves my system, it only lasts a couple of days but is the worst part. The rest of the month I'm fine (which is most of it) but stuck in this pattern until something new hits the market. There's quite a few of us on here in this position as we don't want to take continuous progesterone because of the side effects x