I actually think its your digestive system! I hve been feeling pops up really high... guess my stomach and intestines are squished! But I definitely think thats what is making the pop! Haha I am 35wks and just noticed it recently.
I'm not sure I got that as well in my second trimester, I'm almost 40 weeks now tho
I get that too. I'm 36 weeks
....later i heard it again... What can that be? I was freaking out lol