The progesterone supplements that women take when they're first pregnant is not Provera - actually, doctors play on the safe side with Provera and don't want you to take it if you are pregnant. From my understanding, it's such a potent form of progesterone that it can cause problems to the little baby. The supplements they give you are usually a suppository or a pill, but I think it's a less potent form.
Starting Provera to bring on a period, even when TTC, is totally normal, though - lots of women do it, so don't worry about that. You'll take it, have your period, take your clomid, and hopefully end up with some rice growing in your tummy!
Hope this helps - if you have any other questions, go visit the TTC board here at soulcysters. It's visited really often and there are some super nice, helpful, and smart women over there who can answer the most random questions.
Good luck!
