No morning sickness at 7wks - am I home free??

[Clueless]

Hi everyone.
I am 7 weeks and 1 day today and so far have not had morning sickness. A couple of times I've felt a bit off colour after lunch but thats it. Am I still in for it or am I one of the lucky ones?
BTW - I was singing very loudly in the car the other day and nearly passed out!! - note to self, humming along may be better!!