If this is your first pregnancy it's half decently acurate. It WOULD probably only reach the belly button at 20 weeks, and not sooner. If this is your second it's much more likely that you'll feel it sooner and/or measure ahead. Mine just so happens to sit super far forward, such that I can feel it right away. Kinda scared my midwife about multples or something but nope. That's just where it was.
9/29/11 at 3:31pm