Confused...?

Megan • Happily married. One 2015 angel baby, little girl born Sept 2016, & one due June 2019.
I started bleeding on 8/17 and miscarried. Saw the doc on 8/24 and ultrasound showed that I had passed everything naturally. My uterus was empty :( Blood draw on 8/26 showed levels at 499. My doc called me the day after to tell me the results. All she said was that my levels were going down (down from what?, never had a prior test to compare to), and that we can try again after I get my next period, and to call her if I had questions. 
I called yesterday because she never told me what my levels were and I wanted a copy of my bloodwork. The OB nurse called back and said I needed to get another blood draw and that my numbers need to be under 10 or I'll need surgery!?!? Why didn't my doc tell me this? 
I'm so confused! It just dredged up all the emotions again. Like torture to go get blood taken. Ugh. Did my doc see something (nothing) on my ultrasound so she wasn't concerned about my levels? 
My next blood draw is scheduled for next Thursday 9/10. 

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