Noticable around 12-13 weeks but really popped at 15-16 weeks. Now I'm 18 weeks and friend who I ahdn't seen me in about a month said I'm huge, although I really don't think I look that big!
I'm almost 16 weeks, and I've gained over 12 pounds, but people still are shocked when I tell them I'm pregnant, so I guess I don't really show to strangers yet. (I'm 5'9") But my husband and I started to think it was noticeable around 14 weeks.
I started wearing maternity clothes at 10.5 weeks, but was still wearing some of my "fat" clothes until around 20 weeks, when I "popped." This is my second pregnancy...
Re: baby bump
I popped around 20 weeks. I could tell before then if I wore a tight fitting shirt, but now others are starting to notice.