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The main idea is a safety guideline used for imaging women of reproductive age, known as the 10 Day Rule. It recommends scheduling radiographs within the first 10 days after the start of the menstrual cycle. The reason behind this window is that pregnancy is unlikely to be established early in the cycle—fertilization typically occurs around day 14 and implantation occurs later—so exposing a patient during this early period minimizes potential fetal radiation exposure if pregnancy were present. In practice, if imaging is urgent, modern approaches rely on confirming pregnancy status and applying dose-saving techniques rather than strictly waiting, but historically this rule guided whether radiographs could be performed without risking an undetected early pregnancy.