Yeah, I've read by 14-16 weeks, usually by the 4th month. However, every woman is different. If you are tall or larger than average you may show later. I'm short and average build - but feel like I'm already showing something in tight clothes. And I'm only 8 weeks!
It really depands on your body type (as mentioned above) the really experience women though, can tell right away because your boobs and waist line is "thicker" I think. I'm 8 weeks along but quite a few people can tell by my body language and certain changes that are obvous. Not necessarly the tummy
Usually the first time your pregnant, you don't show until around 18 to 20 weeks, but it also depends on your body. In my opinion if your shorter and skinnier you tend to show faster. I'm 16 weeks and i'm showing already, but i'm also short.
i'm just under 12 weeks and it's not obvious MOST of the time but my clothes don't fit right at i've had a couple of people point out to me lately that they can see a bit of a belly. depends on what i'm wearing.
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