HELP! Any advice?🌈

SORRY IN ADVANCE FOR THE LONG POST. So I'm 6w pregnant today (7/23/17) with what I hope is my rainbow baby. I miscarriaged aug. 2016. I have finally got pregnant again after 2 failed fertility treatments! (This would have been my second cycle without treatments) i went on 7/12 and got blood drawn and tested to see where my levels where starting. Progesterone was 16.9 and HCG was 52. I went again on 7/20 and checked my levels again. Progesterone dropped to 6 and HCG was at 158. 1st nurse I talked to was very rude and just plain out said I was miscarriage. But I had some questions and called back and talked to a different nurse that said she was gonna put me on 200mg progesterone supplements to take twice a day. Told me there was still a chance but if a MC was happening that the supplements would sadly not save it. Has anyone had any experience with these kind of numbers? Or is a MC what it looks like is happening? I go back Thursday (7/27) to check my levels again. 🌈

THANK YOU FOR ANY ADVICE AND ANY PRAYERS.