I have intermittently. The only reason I used it intermittently is that I often forget, since I always feel so much better when I'm on hcg. Progesterone cream never affects my losses. I know that for overall health, and probably for hcg also, it's best to use the right kind of progesterone cream. This is what I have read and been told:
Not all progesterone creams are alike. Make sure to get one that is natural, organic, bio-identical and not synthetic. Emerita is a very good one. Ann Louise Gittleman also has one called ProgestaKey. I don’t know much about it.
Please keep in mind natural does not imply organic. Many of these creams have not only the main ingredients based on phytoestrogens, but also have the toxic xenohormones, parabens and mineral oil too. They are far from organic. So be aware and ask questions about your creams!