progesterone levels?

So I had to get blood work done today to check my progesterone levels.. not sure how long it takes to get the results back. I started my first round of Clomid this month and the doctor said 10 days after A positive ovulation test I needed to get blood work done.. can anyone give me some insight into what questions I ask or what my level should be! I took a pregnancy test yesterday and it was negative so I was kind of bummed but no AF is not supposed to be here until the 17th