first trimester of pregnancy

例句：

1. 1.During the first trimester, women often experience nausea and fatigue.
   在第一孕期，女性常会经历恶心和疲劳。
2. 2. The first trimester is considered a critical period for fetal development.
   第一孕期被认为是胎儿发展的关键时期。
3. 3. Women should monitor their blood sugar levels during the first trimester to prevent complications.
   妇女应在第一孕期监测血糖水平，以防止并发症。