I've been pregnant four times.
Each has been different.
With this one, I was about 4 weeks when I became very sicky-feeling, but it could also be because of the possible multiple there might have been in there that we lost.
With my first, it was my feeling slightly queasy at 6 weeks-ish that made my mate suggest a test (wasn't trying). Same re second pregnancy (lost) and with last one (lost), about 6 weeks too I think, and then I was very sick, but not as sick as this time.
It can vary and also depends on how many babies are in there. My friend is 7 weeks ahead and I'm sure she said she's not been or felt sick once? Flip.