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I used natural progesterone cream to regulate my periods originally, but used it to lengthen my LP to get my BFP.
The first month, like you said, went off without a hitch. I stopped the cream and then immediately started my period. The next month, I stopped the cream, and it took a few days to start my period, which was extremely light that time. Unfortunately, I don't have more information than that because the third month I used it is when I got my BFP.
The only thing I can guess is different between the two of us is the fact that your doctor told you to continue taking it until your period started, whereas all of the research I did said to stop the cream when you would start your period. In a natural cycle, the halt of progesterone is what starts your period.
Good luck!

I am on progesterone supplements also, vaginal inserts. This is my second month using them. The first time I went to 16 dpo and finally had a blood test done with negative results. This time I am at 11 dpo with a test scheduled for Thursday. I believe these supplements make cycles longer. What I would really love to know is if they artificially increase the temperatures on the BBT chart. I am not sure if I was helpful here, but I felt like answering because I am also unsure about the additional progesterone. Best wishes and the Lord's blessings.