Popping/cracking noise?

Alexandria • 24 years old; Twin Girls EDD March of 2015 ( or sooner )💕
Hey Ladies!
Has anyone else experienced a popping/cracking noise in their belly when baby loves occasionally? It almost sounds like if you were to crack your finger underwater? Baby girl just moved and I heard this crack/PPP sound and wanted to see if anyone else experienced this and possibly knew what it was?