When did your morning sickness start ?

Soo this is my third pregnancy . With my first I didn’t really get morning sickness only if I ate something he didn’t agree with or just really nausea,then my second pregnancy I found out super early but didn’t start getting sick until week 6 and I was nausea and vomiting all the time !! It was horrible . This pregnancy im in my 6th week and still nothing ! Don’t get me wrong I love not feeling queasy and sick but it is making me a little worried . Did any other mamas not ever get sick or maybe just nausea here and there ? Close family thinks it’s a girl just because of how different it is from my first two since they were both boys but I’m just more curious as to if it’s okay or not .