I'm 14 weeks pregnant on Wednesday with 3rd and have been feeling movements from about 10 weeks (honest! and not just wind!)
Been feeling them a bit more, and more frequently too, from about 12 weeks but for past 2/3 days now, nothing 
I haven't gone to emergency room as I feel a bit silly with it being so early on, though have been told by the experts that you do feel movements sooner with each subsequent baby.
I guess I'm just after reassurance from people who may've experienced similar, at such an early stage, but then had movement again? 