Morning sickness?

Anna
Im 6 weeks 6 days, 7 weeks tomorrow and I don't have any mornin sickness yet.
​With DS I had it within 5 weeks as soon as I knew I was pregnant basically I started throwing up and threw up for the next 8 months, this is my 2nd pregnancy and I have no sickness. No queezyness, no upset stomach, nothing. Is this normal during 2nd pregnancies?