If you use a sports bra to work out does it stop and or shrink your boobs?

I heard if you wear a sports bra while working out it will stop the growth of your boobs and they will then become smaller because the first things that you lose are your butt and your boobs?
I need to know cause I don't want to lose my boob size if anything increasing the size would be better then to lose them while exercising..pls help!!!
 
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