Is this baby moving?! ?

So I'm currently 18 weeks and 2 days pregnant and since about 17 weeks I've sworn I've felt baby move. It feels like one quick dull pulse/throb, then it goes away and it only happens when I'm laying down or am still. It can happen a few times a day or only once/twice. 
I've looked everywhere online but haven't found much. Most ladies say it's a butterfly feeling when bub moves so I'm unsure. ?

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