If I heard "There are a couple girls" I would assume two. Someone telling me who is waiting should be able to tell the difference between two and three people. Someone who says "in a couple days" is probably making an estimate - I'd be willing to accept the "three" meaning because the person may not know exactly.
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AnonymousThere are a couple of girls waiting for you.Hi A
I just need to make a couple more calls.
You'll be all right in a couple of days.
"a couple of" means both "two" and "a few". How do you understand when it means "two" and when "a few".