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<title>月经不规律,预产期按什么算?</title>
<!-- 孕期专题 · 待产准备 · 预产期(首页「其他妈妈也在搜」按孕周分段新增,2026-11-02)
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<script>window.TOPIC = {
"slug": "yuchanqi",
"q": "月经不规律,预产期按什么算?",
"eyebrow": "待产准备 · 预产期",
"title": [
"月经不规律",
"\n",
"预产期",
"按什么算?"
],
"sub": "一张卡看懂:公式、特殊情况、早孕 B 超校正",
"answer": "以<em>早孕 B 超<\/em>(最好 11~13+6 周量的头臀长)为准;试管的按<em>移植日<\/em>算。",
"three": [
{
"b": "速算:月份 +9,日期 +7",
"s": "结果和精确的 280 天可能差 1~3 天"
},
{
"b": "早孕 B 超最准",
"s": "和月经算的差得多,医生会按 B 超改"
},
{
"b": "预产期是个范围",
"s": "37~41+6 周生都算足月,正好那天生的不多"
}
],
"sections": [
{
"type": "steps",
"title": "3 步算出来",
"en": "HOW TO",
"key": "拿出日历,跟着算一遍。",
"tint": true,
"items": [
{
"b": "找到末次月经第一天",
"s": "是来月经的第一天,不是结束那天,也不是同房那天"
},
{
"b": "月份加 9(或减 3)",
"s": "1~3 月来的加 9,4~12 月来的减 3 并顺延到下一年"
},
{
"b": "日期加 7",
"s": "例:末次月经 2026 年 4 月 1 日,速算是 2027 年 1 月 8 日前后"
},
{
"b": "交给工具精确算",
"s": "按 +280 天算是 2027 年 1 月 6 日,以产检时医生核对的为准"
}
]
},
{
"type": "cards",
"title": "4 种情况怎么算",
"en": "CASES",
"key": "不是人人都能直接套公式。",
"tint": false,
"items": [
{
"name": "月经规律",
"verdict": "直接算",
"must": true,
"label": "末次月经",
"amt": "+280",
"unit": "天",
"when": "周期 28 天左右最准"
},
{
"name": "周期偏长",
"verdict": "要顺延",
"must": false,
"label": "比 28 天长几天",
"amt": "+几天",
"unit": "",
"when": "周期 35 天,大约往后推 7 天"
},
{
"name": "记不清",
"verdict": "看 B 超",
"must": true,
"label": "早孕期头臀长",
"amt": "B 超",
"unit": "",
"when": "6~13 周的测量最准"
},
{
"name": "试管",
"verdict": "按移植日",
"must": false,
"label": "移植 5 天囊胚",
"amt": "+261",
"unit": "天",
"when": "3 天胚胎 +263 天"
}
],
"why": {
"q": "B 超和月经算的不一样,听谁的?",
"a": "早孕期(13+6 周前)B 超量的头臀长误差很小。如果和按月经算的相差超过 5~7 天,医生通常会按 B 超改预产期;一旦定下来,后面孕中晚期 B 超显示“偏大偏小”就不再改了,那反映的是宝宝长得快慢。"
}
},
{
"type": "timeline",
"title": "预产期前后都算正常",
"en": "TERM",
"key": "预产期是 40 周那天,前后几周都可能发动。",
"tint": true,
"cols": [
"<37周",
"37~38周",
"39~40周",
"41周+"
],
"weeks": [
[
28,
37
],
[
37,
39
],
[
39,
41
],
[
41,
43
]
],
"rows": [
{
"name": "叫法",
"bars": [
{
"t": "早产",
"span": 1,
"cls": "dash"
},
{
"t": "足月",
"span": 3,
"cls": ""
}
]
},
{
"name": "准备",
"bars": [
{
"t": "备待产包",
"span": 1,
"cls": "lt"
},
{
"t": "随时可能生",
"span": 2,
"cls": "lt"
},
{
"t": "听医生",
"span": 1,
"cls": "dash"
}
]
}
],
"tips": [
"待产包可以开始准备",
"随时可能发动,注意信号",
"到预产期了,放平心态",
"医生会评估是否催产"
],
"legend": [
[
"",
"足月"
],
[
"lt",
"日常"
],
[
"dash",
"听医生"
]
]
},
{
"type": "doc",
"title": "这些情况请医生核对",
"en": "SEE A DOCTOR",
"key": "第一次产检时主动提出来。",
"tint": false,
"b": "这些情况,请医生帮你核对孕周",
"s": "预产期定准了,后面的 NT、唐筛、大排畸才能约在对的时间。",
"tags": [
"月经不规律",
"记不清末次月经",
"哺乳期又怀孕",
"刚停避孕药",
"试管助孕",
"B 超和月经差很多"
]
}
],
"tools": {
"title": "算好预产期之后",
"items": [
{
"id": "chanjianrili",
"why": "按预产期排好整个孕期的产检",
"btn": "去看"
},
{
"id": "daichanqingdan",
"why": "提前列好待产包,不慌",
"btn": "去列"
}
]
},
"sources": [
"中华医学会妇产科学分会《孕前和孕期保健指南(2018)》:首次产检核对孕周,根据末次月经、早孕反应及早孕期超声推算;如孕周与早孕期超声估计的胎龄相差超过 5 天,应根据超声结果校正预产期",
"人卫版《妇产科学》(第 9 版):预产期计算方法为末次月经第一日起,月份减 3 或加 9,日数加 7;足月妊娠为 37~41+6 周,满 42 周为过期妊娠",
"ACOG Committee Opinion No.700《估算预产期的方法》(美国):早孕期超声(头臀长)是确定或校正孕龄最准确的方法;辅助生殖按胚胎移植日推算(5 天囊胚 +261 天,3 天胚胎 +263 天)",
"国家卫生健康委《孕产期保健工作规范》:早孕期建册时核实孕周,按孕周安排产前检查"
],
"heroAlt": "孕妈妈坐在桌前,看着墙上日历圈出的日子",
"color": [
"#109C9C",
"16,156,156",
"#E5F6F6"
]
};</script>
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