Baby Moving or Just Gas?

I'm 19 weeks pregnant and just wondering about baby movement. Sometime last week or so while laying in bed, I felt something almost...popping inside me, in my lower abdomen. I thought this might be the baby moving but I wasn't sure. I've felt it maybe 2 or three more times since then in my lower abdomen. For the past few days, I've felt a similar feeling in the upper part of my stomach, above my belly button. I know at 19 weeks my uterus is almost to my bellybutton, so would this feeling just be gas? I hear baby movement and gas feel similar sometimes, LOL. If it is just gas, is what I felt last week in my lower abdomen the same thing? And if that was actually the baby moving, is it normal not to feel it all the time? I haven't felt it in my lower abdomen in quite a few days, but I've felt it in my upper stomach almost daily. I'm confused =/
*OBVIOUSLY, I know the baby is not stepping outside my uterus and kicking me in the ribs. Sorry if my question sounds dumb to you, perhaps I'm not wording it correctly so you get what I'm saying.

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