‘孕期’ literally combines ‘孕’ (yùn), meaning ‘to be pregnant’ or ‘pregnancy’, and ‘期’ (qī), meaning ‘period’ or ‘duration’. Together, they form a compound noun referring specifically to the entire time span from conception to childbirth — typically about 40 weeks in medical contexts. It is a formal, neutral term used in healthcare, public health education, and daily conversation when discussing pregnancy-related matters.

This word emphasizes duration and stage rather than biological process or emotional experience. It commonly appears in phrases like ‘孕期检查’ (prenatal checkups), ‘孕期营养’ (prenatal nutrition), or ‘孕期反应’ (pregnancy symptoms). Unlike colloquial terms such as ‘怀孕’ (to become pregnant) or ‘身孕’ (a literary/old-fashioned term for pregnancy), ‘孕期’ always denotes the timeframe itself, not the event of becoming pregnant or the state of being pregnant per se.