it is different for everyone... my nauseau didn't show up till the 7th week... up till then I didn't even know I was preggers... and it has subsided a lil bit but its still there....
I started getting a slight bump at 9-10 weeks... I guess this is one of the times my being overweight was a good thing coz I didn't show... and even now I am sooo thankful to Allah I have a bump but I can still wear my pants although I have to fasten them low....
Something that helped me a lot with the nausea was dry aloo bukhara.... try it...it might help you as well...