My midwives are pretty much legally bound to stay between 37 and 42. However, if there is a discrepency with when the due date is they will change it one way or the other if that helps and it's reasonable.
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For instance, I *know* my EDD is the 18th (or VERY close) but if they go by my US (at 10 weeks, because I got pregnant with an IUD
) it would be the 26th. Since mine have all been born before 40 weeks we are going with the 18th as the "official" edd. If I would go over and everything is fine they could change it to the 26th so I'd have longer before having to transfer care.
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Personally I wouldn't even consider having a HB before 36 weeks, and before 37 it would depend on the situation. If I thought perhaps my EDD was wrong I may be a little more flexible.