Your uterus doesnt even start getting big enough to be in your stomach are until atleast 4-5 months. Women who are having their first babies or are overweight also show later and take longer to "look" pregnant. Thinner women and second time moms tend to show sooner.
My old teacher told us she was 5 months pregnant and you wouldn't have guessed that she was. So I guess its varies between person to person.
it's always different for every person. some people do end up showing at only 3 months and some never show at all.
i started showing like my 6th so around there am guessing (nd i wasnt big before my pregnacy)
but take my word for it...im not a girl o_o
Some women start showing at about Week 9.
probably 4 or 4 and a half months
Definatately by 5/6 months