Welll...
My advice is to not to. As I mentioned progesterone cream has not appeared in studies to help anyone get and stay pregnant. And we often see this stairstep pattern of a rise, then another rise, then another rise and only after several of these "stairsteps" does ovulation actually occur. Progesterone WILL prevent ovulation. So if there's an egg in there that might be released, and you start the prog cream, that will stop the egg's development (and may make a cyst that could take months to resolve.) IF the prog cream actually did help people get/stay pregnant I might be more open to the idea but my fear is that you'll end up stopping true O to include something that doesn't actually even work, if that makes sense.