I'm 21 weeks with my first baby. I felt something like bubbles at 16 weeks, since then I'm just not sure if I'm feeling kicks or if it's just twinges/ twitches in my muscles. Last night I felt as if I had a twitch in my stomach - like when your eyelid spasms or you get a jumpy muscle somewhere - which moved from place to place, most often deep down at the top of my pelvis. It happened mostly when I turned from one side to the other. Is that the baby moving, do you think?