I felt flutters earlier in my pregnancy but I'm starting to feel something a bit different. It's like heavy gas bubbles and I usually only feel it when I'm sitting still (especially at my desk). I don't pass gas after feeling this. It almost feels like, at times, that I'm going to but I don't. That's kind of what's making me unsure if it's gas or baby moving. If I put my hand on my stomach where I felt the movement internally, it stops. It's definitely not something I can feel from outside.

I'm 21 weeks and have an AP.