Serum Progesterone test results

Zee

This is my first cycle on Letrozole (unmonitored). I got my blood drawn to check my progesterone on CD 20 since they were closed the next day and the results were 16.3 ng/mL. They were unable to do an ultrasound. I looked it up on Google and believe that’s a good number, but just wanted to see if anyone else could provide their experience. Adding my chart just because.