Popping Sound?

I am 37 weeks pregnant, anyone know what that popping sound is, at first I thought i was going crazy but I've heard it to many times!

About Cheyenne
Current: Elk Grove, California
Birth: October 22
On Moms.com since: Jul 22, 2014
I am a mother of a 7 year old 2nd grader!! And currently 37 weeks pregnant with our 2nd boy! Stay at home mother with a full time hard working husband.
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