Popping durning sex?

So for the past couple times, and only when I'm
On top, my boyfriend and I feel and hear a popping noise. It's NOT queefing. Sounds almost like a joint popping. It does not feel uncomfortable or painful. For the first time yesterday, after hearing the popping, I had some very light  spotting when I wiped. Anyone have any clue as to what's going on? 

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