My MIL insisted it was too early at 18/19wks to get kicking up that high (infact she pointed and said you only get them 'down there'!), but I did. I was in the car so sat up. Compared to some people I am carrying quite high (my bump starts about 1.5inches below my sternum) and could feel kicks just beneath my sternum and a couple under my ribs ...it's all much more obvious now I am 21+2 so can say with absolute confidence that yes they were kicks and they were up that high!
I thought they couldn't and babies were low down, but at my scan yesterday when she did the head it was much much higher up than I expected! So I guess if the baby is feet up then it's perfectly feasible to feel it that high!