Progesterone and pregnant

I am about 6 weeks preggs and was told that I should take progesterone by my doctor because my levels were low. When I got the pills, they were provera ( which is progestin) and say do not take if pregnant. Also they said to take orally and my doctor said it should be taken vaginally.. I mentioned that to the pharmacist and she crossed out that part😳. Soo should I take it??