Reassurance needed

So I have a son so have been pregnant before (but I do feel like you forget what it feels like!)
Anyway, I am 7 weeks and at the beginning I definitely 'felt' pregnant, and felt sick. With my son I felt sick from about 6 weeks and always in the morning or if I didn't eat. The thing is I feel absolutely fine at the moment which is worrying me a little. When I went to the doctor she said 'you do feel pregnant don't you?'. Now that's got me worrying as I just feel normal now. It doesn't help that I have two friends with quite bad sickness and tiredness and I'm wondering why I don't feel like that?
Has anyone else had this? X