Oh my god I just had this and can;t believe you posted it too as I thought I was going mad!!! Feels like a vibration down below and very odd? I haven't a clue just glad I am not the only one experiencing it!
I think the vibration could be yawning? because babies kind of shake when they yawn.. so cute. I've felt my tummy vibrate a few times.. and I asked my mom and she told me that when she was having an ultrasound of me (back in 1992) that she felt the vibration, and on the screen I was yawning and stretching.
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