大姨妈在的时候能不能怀孕
<p><span word="It">It</span>'<span word="s">s</span> <span word="a">a</span> <span word="question">question</span> <span word="we">we</span>'<span word="ve">ve</span> <span word="all">all</span> <span word="probably">probably</span> <span word="asked">asked</span> <span word="ourselves">ourselves</span>, <span word="and">and</span> <span word="one">one</span> <span word="we">we</span> <span word="thought">thought</span> <span word="there">there</span> <span word="was">was</span> <span word="a">a</span> <span word="definite">definite</span> <span word="answer">answer</span> <span word="to">to</span>: <span word="can">can</span> <span word="you">you</span> <span word="get">get</span> <span word="pregnant">pregnant</span> <span word="on">on</span> <span word="your">your</span> <span word="period">period</span>? <span word="Well">Well</span>, <span word="the">the</span> <span word="answer">answer</span> <span word="is">is</span> <span word="yes">yes</span> - <span word="but">but</span> <span word="it">it</span>'<span word="s">s</span> <span word="very">very</span> <span word="unlikely">unlikely</span>, <span word="so">so</span> <span word="hear">hear</span> <span word="us">us</span> <span word="out">out</span>.</p><p>我们可能都问过自己这个问题，我们也认为这个问题的答案十分肯定：经期能怀孕吗？答案是：能--但可能性不大，请听我为您娓娓道来。</p><p><span word="First">First</span>, <span word="it">it</span>'<span word="s">s</span> <span word="important">important</span> <span word="to">to</span> <span word="understand">understand</span> <span word="how">how</span> <span word="the">the</span> <span word="monthly">monthly</span> <span word="cycle">cycle</span> <span word="works">works</span>. <span word="Menstruation">Menstruation</span> <span word="is">is</span> <span word="in">in</span> <span word="essence">essence</span> <span word="the">the</span> <span word="shedding">shedding</span> <span word="of">of</span> <span word="the">the</span> <span word="endometrium">endometrium</span>, <span word="which">which</span> <span word="is">is</span> <span word="the">the</span> <span word="inner">inner</span> <span word="lining">lining</span> <span word="of">of</span> <span word="the">the</span> <span word="uterus">uterus</span>. <span word="On">On</span> <span word="the">the</span> <span word="first">first</span> <span word="day">day</span> <span word="of">of</span> <span word="your">your</span> <span word="period">period</span>, <span word="hormone">hormone</span> <span word="levels">levels</span> <span word="drop">drop</span> <span word="and">and</span> <span word="menstrual">menstrual</span> <span word="blood">blood</span> <span word="flows">flows</span> <span word="from">from</span> <span word="the">the</span> <span word="uterus">uterus</span> <span word="through">through</span> <span word="the">the</span> <span word="small">small</span> <span word="opening">opening</span> <span word="in">in</span> <span word="the">the</span> <span word="cervix">cervix</span>, <span word="shedding">shedding</span> <span word="the">the</span> <span word="tissue">tissue</span> <span word="lining">lining</span>. <span word="Around">Around</span> <span word="day">day</span> 14 <span word="of">of</span> <span word="the">the</span> <span word="monthly">monthly</span> <span word="menstrual">menstrual</span> <span word="cycle">cycle</span>, <span word="hormones">hormones</span> <span word="cause">cause</span> <span word="a">a</span> <span word="mature">mature</span> <span word="follicle">follicle</span> <span word="in">in</span> <span word="the">the</span> <span word="ovaries">ovaries</span> <span word="to">to</span> <span word="burst">burst</span>, <span word="then">then</span> <span word="release">release</span> <span word="an">an</span> <span word="egg">egg</span> <span word="from">from</span> <span word="the">the</span> <span word="ovary">ovary</span> (<span word="ovulation">ovulation</span>). <span word="The">The</span> <span word="egg">egg</span> <span word="travels">travels</span> <span word="down">down</span> <span word="the">the</span> <span word="Fallopian">Fallopian</span> <span word="tube">tube</span> <span word="toward">toward</span> <span word="the">the</span> <span word="uterus">uterus</span> - <span word="a">a</span> <span word="sperm">sperm</span> <span word="can">can</span> <span word="unite">unite</span> <span word="with">with</span> <span word="an">an</span> <span word="egg">egg</span> <span word="here">here</span>, <span word="fertilising">fertilising</span> <span word="it">it</span>. <span word="However">However</span>, <span word="if">if</span> <span word="the">the</span> <span word="egg">egg</span> <span word="is">is</span> <span word="not">not</span> <span word="fertilised">fertilised</span>, <span word="the">the</span> <span word="egg">egg</span> <span word="breaks">breaks</span> <span word="apart">apart</span> <span word="and">and</span> <span word="is">is</span> <span word="shed">shed</span> <span word="during">during</span> <span word="the">the</span> <span word="period">period</span>, <span word="which">which</span> <span word="occurs">occurs</span> <span word="back">back</span> <span word="around">around</span> <span word="day">day</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="cycle">cycle</span>.</p><p>首先，理解经期的运作方式是非常重要的。本质上，月经是子宫内膜的脱落。大姨妈来的第一天，激素水平下降，姨妈血从子宫流向子宫颈的小开口，使得组织内膜脱落。经期周期的第14天左右，激素使得卵巢中的成熟卵泡破裂，导致卵巢排卵。卵子从输卵管向下移动到子宫--精子可在此与卵子结合、受精。然而，如果没有受精，卵子就会分裂，在经期脱落，这一情况在经期周期的第一天发生。</p>
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