accidental pregnancy的用法和樣例：
例句
- If pregnancy doesn't occur for several cycles, the lining continues to increase in thickness until cysts form in it.
如果母貓在幾個發情期內都沒有受孕，那麽子宮內膜會繼續增厚，直到形成囊腫。 - To ensure a healthier pregnancy, the report also urges doctors to counsel women to lose weight before conceiving.
為確保一次更健康的懷孕，該報告還敦促醫生要勸告女性在受孕之前減肥。
