Confused on blood draw lingo

Sabrina

I had a trigger done 1/28 and blood draw yesterday. She said they consider anything above 5 positive I was 15 when she called with the results and said it’s positive and my progesterone was at 20. 15 what and 20 what? She said I have to come back for blood work again tomorrow. Is there a chance this could be the trigger still? I ask because today is also my 30th birthday and confused on what 15 and 20 is is that low is it average could it be the trigger 🤷‍♀️ I’m lost on the lingo!!