When should morning sickness start?

Amber • TTC our rainbow after losing our angel in June 👼🏽💙
I'm 7weeks & 4days, I haven't experience ANY nausea or sickness whatsoever.. I feel like a copout. 
To the point where I don't even think I'm pregnant lol.. I feel so sorry for everyone that experiences morning sickness.. Every female in my family experienced it horrifically. 
My family are not worried and keep saying "you're probably just having a boy!" Everyone has girls and suffered, with the boy they didn't.. ( I know it's not always the case) 
But I feel uneasy. I know I should be happy but I feel like something is wrong !!