大姨媽在的時候能不能懷孕大綱

It's a question we've all probably asked ourselves, and one we thought there was a definite answer to: can you get pregnant on your period? Well, the answer is yes - but it's very unlikely, so hear us out.

我們可能都問過自己這個問題，我們也認爲這個問題的答案十分肯定：經期能懷孕嗎？答案是：能--但可能性不大，請聽我爲您娓娓道來。

First, it's important to understand how the monthly cycle works. Menstruation is in essence the shedding of the endometrium, which is the inner lining of the uterus. On the first day of your period, hormone levels drop and menstrual blood flows from the uterus through the small opening in the cervix, shedding the tissue lining. Around day 14 of the monthly menstrual cycle, hormones cause a mature follicle in the ovaries to burst, then release an egg from the ovary (ovulation). The egg travels down the Fallopian tube toward the uterus - a sperm can unite with an egg here, fertilising it. However, if the egg is not fertilised, the egg breaks apart and is shed during the period, which occurs back around day one of the cycle.

首先，理解經期的運作方式是非常重要的。本質上，月經是子宮內膜的脫落。大姨媽來的第一天，激素水平下降，姨媽血從子宮流向子宮頸的小開口，使得組織內膜脫落。經期週期的第14天左右，激素使得卵巢中的成熟卵泡破裂，導致卵巢排卵。卵子從輸卵管向下移動到子宮--精子可在此與卵子結合、受精。然而，如果沒有受精，卵子就會分裂，在經期脫落，這一情況在經期週期的第一天發生。

So can you get pregnant during your period?

所以，大姨媽來的時候究竟能不能懷孕？

The odds of getting pregnant during your period are extremely low, but it can (and has) happened. During your period, the part of the menstrual cycle when the egg is released and therefore has the potential to unite with a sperm (aka ovulation) is still several days away. But there are exceptions. According to the American Pregnancy Association, "If you happen to be one of the individuals who has a shorter cycle, there is a chance you could get pregnant while having sex during your period."

經期懷孕的可能性非常低，但的確是有可能發生的（而且也的確發生過）。大姨媽期間，排卵並有可能與精子結合的月經週期部分可能還要過幾天才會發生。但也有意外。據美國懷孕協會表示，"如果你的經期較短，那在經期發生性關係就有可能使你懷孕。"

This means that the time between your period and your ovulation is closer together. Sperm can live inside of you for up to five days after it is released, so if you have sex toward the end of your period, it would hypothetically be possible to conceive four or five days later with your early ovulation. "The probabilities of getting pregnant while on your period are low, but the possibilities are there," says the APA.

這就意味着你的經期和排卵期相近。精子排出後能夠在你身體內存活長達5天的時間，所以如果你在經期快要結束時發生性關係，理論上而言，這些精子可以與四五天後較早排出的卵子結合。"經期懷孕的可能性很低，但還是可能的，"美國懷孕協會的人員說道。

What about right before or right after your period?

那經期前或經期後呢？

As mentioned above, the time after your period is when preovulation and ovulation begins and hormones increase. This means you are most fertile between day 11 and day 21 (approximately) of your menstrual cycle, says the American Pregnancy Association.

如上所述，經期結束之時正是排卵前和排卵開始以及激素增加之時。這就意味着在你經期的第11天和第21天（大約）之間你是最容易受孕的，美國懷孕協會表示。