When did you have a NST?

Morgan
Hi ladies!
I'm 28 weeks like mono/di boys. 
My OB recommended starting weekly non stress tests next week. Is this normal, or is she worried about something and not telling me?
They were growing 20% different from each other but now only 10% and my US this week looked great. They're both about 2.5 lbs- little chunkies! 

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