Depends on how many days your cycle usually lasts. If it is more than a week late, and you've not been under a lot of stress nor had any medication changes in your system, then I would worry and take a pregnancy test (in case you're worried about it).
A week, I'd say. I start worrying as soon as it's late, but I don't freak unless it's a week late. And it hasn't ever been over a week late, at least, not since I've been keeping track. knock on wood.
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