Doubling the dose of progesterone?

i see some ppl take up to 600mg of progesterone a day, my dr prescribed me synthetic progesterone suppositories 20mg 2x a day, and i was told that is not as safe as the natural cream but that being absorbed in your vagina is stronger than the cream being absorbed on your skin, the cream i have is 20mg a pump and i was wondering if i do a dbl pump will that be 40 mg being absorbed? i plan on doing this 2 x a day, so together if in my head i am correct ill be getting closer to 80 mg a day, which is lower than the original dose of 200mg prometrium i got first, but my insurance wouldnt cover it, so if i do 2 pumps 2 times per day, would it be better to use 4 different application spots or 2, is there a way to have it better absorbered or am i just wasting cream, sorry if confused, and thank you for answers