Is the pink pad app accurate?

I have been using the pink pad app on my iPhone and so far the period dates have been a little off a day or 2 but now it's October 17th but the pink pad app said I was suppose to come on October 14th. I really worried could it just be that I'm coming on next week or so?

Sometimes woman have hormonal imbalances. After all, it's only a close estimate

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