This ALL depends on if this is the person's first or subsequent pregnancies.
I can tell you that I had NOTHING showing until week 22 of my first pregnancy. I really did not need maternity until I was 6 months.
I'm now 17 weeks with my 2nd and definitly showing a real bump. I can hardly believe it and asked my OB about it at my last week appt. First she said at 16 weeks your uterus is the size of head of cabbage, and comes just below your belly button (which takes up MUCH more space than a pear, which is still behind the pubic bone in an unpregnant uterus). There is not enough gas in the world that could cause my belly to be this big, not to mention I'm down 5lbs from my pre-pregnancy weight.
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