I'm getting a bit worried about not feeling ill enough!
With DC1 I had constant nausea up until 12 weeks (can't remember when it started, maybe 6 weeks), but was only sick a little - maybe once / twice a day during the worst couple of weeks.
With DC2 I had hyperemesis from 5 to 25 weeks, was hospitalised at various points, took antiemetics and just felt generally horrible 24 hours a day.
I am now in the early stages with (we hope) DC3 (6 weeks ish), but don't feel too bad. Very tired, waves of nausea that last an hour or two, but it definitely comes and goes, and in between I feel fine. I've only actually been sick twice.
I've also had a couple of early MCs (barely felt sick at all with these pregnancies) so I'm on the nervous side. I can't believe I actually want to feel worse - well, I'm sure I don't, but I had resigned myself to another awful pregnancy, and the "normal" level of morning sickness that I'm experiencing doesn't seem enough to put my mind at ease.