Low progesterone

I had a miscarriage a year ago... I found out I was pregnant a little over a week ago. I had my blood drawn this last Friday to check HCG levels it was at 5,000 and I got my blood drawn again yesterday and it was at 16,000, and my doctor mentioned that my progesterone levels were on the low side. I hadn’t little bit of light brown spotting this morning, and they cannot get me in for a sonogram until Tuesday. Anyone have this happen and have a good outcome?