Progesterone levels

This previous Wednesday I went to the doctor at 5 weeks and 3 day to check my progesterone and HCG. My progesterone levels were 6.7ML. I was asked to return in 48 hours (5 weeks and 5 days) my Progesterone dropped to 5.6ML. They said my HCG was rising but my decline in progesterone was an indication that my pregnancy isn’t developing as it should but I should keep my appointment in 2 weeks just in case and try progesterone suppositories. Has anyone had this experience and it turned out to be a viable pregnancy?