Anyone Else

I'm 18 weeks pregnant this time, and I keep feeling like my back is popping constantly. It isn't me cracking my back, but feels like air pockets popping all over. I can stand up, sit down, turn, and pretty much it will pop. Not loud enough to hear it out loud. I've never had this with my first one, and figured it's just my body trying to make more room. There's no pain and it's not to concerning to my Doctor. I'm not asking for advice; just want to know if any of you's are experiencing this too.