Depends on where you are, your doctor and what you have going on. I think the norm (no complications, etc.) in the US is to start checking at 36 weeks. At least that was for me, several friends and my sister (who all went to different clinics in different states). As for what you are measuring, that can change a little. I was measuring ahead and now I'm right where I should be. My dr told me yesterday that was normal.
I'm in germany and they started checking me at 37 weeks. I found it to be more of a hassle than anything. It doesn't really tell you anything. Some people dilate to a 3 and still need an induction...others stay closed all the way to 40 weeks and go on their own. it kind of sucks to get excited about 1 or 2 cm of dilation and still carry over your due date
With me in Canada im being checked on the 26th when im 39+5. No checks until then. Ive had a completely complication free and healthy pregnancy *knock on wood* so far. So that may be why i wasnt being checked sooner.
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