Advice please about progesterone

Alison
My dr wants me ok progesterone cream. It's $700 ins don't cover it. He also gave meprometrium 2X a day. Insurance will only cover once a day. I bought progesterone cream at gnc for $16 and then I figured I would take my oral progesterone once a day since my ins will cover that. Do you know if the progesterone cream I bought works ?? Thanks !!