Haven't felt baby today..

Kim • Pregnant with #1 after about a year of trying. Due end of October and very excited!
FTM question here... 
I'm 18w 3d and I've been able to feel baby's kicks for about a week now.  But I haven't felt her move at all today. I usually feel her in the mornings, but didn't feel her this morning.  Should I be concerned?  Is it too early to be concerned about not feeling movement since the movements are not as consistent at this point yet? Just don't know...