Hi, I would say that in both NAmE and BrE, the meanings of 'two' or ' a few' are possible. The context would often make this clear. eg Tom and Mary are a married couple clearly means 'two'.
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CliveI'll be ready in a couple of minutes sounds like the person does not mean precisely two.OK, but what about when you say "They've been officially married for (correct me if I'm wrong about the use of "for") couple of weeks."?