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Periods may be annoying, but at least they're predictable - sort of. If yours is a little delayed this cycle, and you're not trying to get pregnant right now, your first instinct is probably to freak out a bit. But don't. 大姨妈很讨人厌，但至少是可以预测的--一般而言。如果这次经期延后了，而你又没在备孕，那你可能会本能地吓一跳。但千万别担心。 There are actually many things that can delay your period that have nothing to do with being pregnant. For instance, many medications list delayed periods as a side effect, especially psychiatric drugs that can elevate your levels of prolactin. (This hormone is produced in low levels by your body at all times, but it becomes elevated during and right after pregnancy to help you produce breast milk.) "Usually women get told [about the possibility] because it's a relatively common side effect" of these medications, explains Raquel B. Dardik, MD at the NYU Langone Medical Center. "So it's not usually much of a surprise." 很多事情都会导致经期延迟，而且这些因素与怀孕一点关系都没有。例如，许多药物都会注明有延迟经期的副作用，尤其是提高催乳素水平的精神药物。（人体总是分泌少量的催乳素，但孕期和孕后，催乳素分泌量会有所提高，有助于奶水分泌。）"通常，女性会被告知经期延后的可能性，因为这是这些药物带来的相对普遍的副作用"，纽约大学兰格恩医学中心的拉克尔·B·达迪克医学博士解释道。"所以经期延迟算不上惊喜。" | 
