Progesterone dropped

Niki

I am not even sure I'm posting this right but I hope it finds you all. I have pcos and struggle with fertility. I am finally pregnant for my 3rd time and have already been told its not looking good. I can't find much on my situation but my problem is that my progesterone level dropped from 28 to 15 in 2 days. I have also been taking prometrium the WHOLE time. is there hope here?