Morning sickness

I am 6wks preg with my third baby. With the first two my morning (allday) sickness was horrible I lost 20+lbs with both and I have 1 boy and 1 girl So my question is has anyone had morning sickness with their 1st 2 pregnancies and not with the 3rd! I'm nervous I haven't been sick yet but I don't remember when started last time! Any advice or stories would be very appreciated tia!