Your chart looks fine. Charts don't look "good" or "promising" until 16+ days of high temps and no AF. All dips and rises in temps during the luteal phase are normal. If your temp either falls quickly the day or so before expected AF, or is on a slower decline the few days leading up to expected AF means likely your period is coming. BBT helps ensure you don't have to waste pregnancy tests because you can tell your period is coming or is about to start so no need to waste tests. Keep going and best of luck
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