Whoa baby! Sudden movements!

I'm 39 weeks pregnant and my baby has been moving but not a lot a lot. Nothing that's been discerning to the obgyn or myself.
But all of a sudden tonight she is moving SO much! This is the most movement I've felt from her in months! She's been nonstop for the past 30 minutes now making some major moves!
I'm a FTM, so could this mean anything? Like labor is near, or maybe she's getting distressed or something?? 
It just has me concerned that all of a sudden she's moving SO much out of no where!

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