Progesterone levels apparently low?

Sarah

I’ve had 3 weekly draws so far and my levels have been at 14.6, then 16.7, and now 15.4. My OB says that it’s low and is increasing me from 200 to 400mg of prometrium, which I’ve been taking sjnce my first draw. I didn’t think my levels were all that low, but maybe she’s just being precautious? Did anyone have a good outcome with these levels?