What’s the latest I can get progesterone levels checked?

I had a positive ovulation test on March 31. Most likely ovulated on the 1st. I work Fridays through Mondays so those days won’t work. My daughter has her well child check up on April 10th at the same clinic (45 minutes from us) if I were to get my progesterone levels checked on the 10th would that be too late and give an inaccurate result?

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