Progesterone levels (please help)

Danielle

At my first blood draw my progesterone level was at 16 and when my blood was redrawn 5 days later it had dropped to 10. I was put on prometrium 200 mg daily and 2 weeks later it's only back up to 16. My doctor doesn't seem concerned but should I be worried that it hasn't gone up more than that? I am currently 7 weeks 4 days pregnant and I'm measuring correctly but I can't help but worry.