Serum Progesterone CD23 was at 76.6

I was put on Letrozole 5mg and since it was a my first cycle with it, I had my serum progesterone test and the results came back with 76.6. The nurse told me it was a really good number. I am currently 11dpo, and since yesterday my boobs became too sore. Hahaha, is this due to high progesterone levels? 😭 I hope for a Letro Baby too!!!