第一次：孕12 -14周之间可以做一次彩超，主要目的是核准妊娠时间，排除胚胎发育和停经时间不符的情况，修正预产期。
For the first time: 12-14 weeks pregnant between can do a exceeds, main purpose is to approve pregnancy time, eliminate embryonic development and menopause, fixed time discrepancies due date.
这个过程循环持续到停经前期——在该段时间里，女性身体开始自然过渡到绝经期。
This continues until perimenopause - the time when a woman's body begins the natural transition to menopause.
这个过程循环持续到停经前期——在该段时间里，女性身体开始自然过渡到绝经期。
This continues until perimenopause - the time when a woman's body begins the natural transition to menopause.
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