should i worry? ftm plz help

im 19 weeks with my first baby. and i feel my baby move every once in awhile and its usually very random when it does occur. its not full blown kicks yet or kicks that can be felt or seen on the outside of my belly so they arent very strong yet. i know its still early so i dont know if i should be worried or not that i havent really felt her today??? i have a doppler and i have checked for her heartbeat and its still strong but is this just normal for me not to feel her daily yet since its still quite early? i really would like some advice & experience just to ease my mind please...