Where should you feel kicks at 18 weeks?

An
I know this question probably sounds ridiculous but I'm kind of a worry wart. 
 
So I've been feeling little kicks for about a week now. I'm 18+1 and I feel them down pretty low, like just above my panty line. I've felt them around my belly button just once and now it's back down low. 
 
Again, I might sound crazy but is this normal? I just would have thought baby would be higher up in my stomach at this point