It all starts with a sperm and an egg.

這一切都始於一個精子和一個卵子。

Sperm are tiny microscopic cells

精子是微小的微型細胞

that are made in testicles.

睪丸中製造的。

Sperm cells mix with other fluids to make semen

精子細胞與其他液體混合，形成精液。

which spurts out of your penis when you ejaculate.

當你射精時，從你的陰莖中噴出。

Eggs live in ovaries.

卵子生活在卵巢中。

And the hormones that control your menstrual cycle

還有控制你月經週期的荷爾蒙。

cause eggs to mature every month.

使卵子每個月都能成熟。

These hormones also make the lining of you uterus

這些激素也會使你的子宮內膜。

thick and spongy to prepare for a possible pregnancy.

厚厚的海綿體，為可能的懷孕做準備。

Every month, one mature egg leaves your ovary.

每個月都會有一個成熟的卵子離開你的卵巢。

This is called ovulation.

這就是所謂的排卵。

That egg travels through your fallopian tube

卵子會通過你的輸卵管進入體內

which takes about 12 to 24 hours.

這大約需要12到24小時。

If semens get into your vagina,

如果精液進入你的陰道。

sperm can swim up through your cervix, uterus, and fallopian tubes,

精子可以通過你的子宮頸、子宮和輸卵管游上來。

searching for an egg.

尋找一個雞蛋。

Sperm cells can live in your body for up to six days,

精子細胞可以在體內存活6天之久。

waiting for an egg to show up.

等待一個雞蛋出現。

Millions of sperms come out during each ejaculation,

每次射精時都會有數百萬精子出來。

but it only takes one sperm to meet with an egg

一將功成萬骨枯

which can lead to pregnancy.

這可能導致懷孕。

When a sperm cell joins with an egg,

當精子細胞與卵子結合時。

it's called fertilization.

這就是所謂的受精。

After that happens,

發生這種情況後。

the fertilized egg begins to divide into more and more cells

受精卵開始分裂成越來越多的細胞。

and moves towards your uterus.

並向你的子宮移動。

The ball of cells get to your uterus

細胞球會進入你的子宮。

about three to four days after fertilization,

大約在受精後三到四天。

where it can float around for another few days.

在那裡，它可以漂浮了幾天。

If the ball of cells attaches to the spongy uterine lining,

如果細胞球附著在海綿狀的子宮內膜上。

pregnancy officially begins.

懷孕正式開始。

This is called implantation.

這就是所謂的植入。

It usually takes around three to four days to finish implanting.

一般需要三到四天左右才能完成植入。

Up to half of all fertilized egg naturally don't implant.

高達一半的受精卵自然不會植入。

They passed out of your body during your period.

它們在月經期間從你的身體裡流逝出來。

When the ball of cells implants into your uterine lining,

當細胞球植入到你的子宮內膜時。

your body starts making pregnancy hormones.

你的身體開始製造懷孕激素。

These hormones keep your uterine lining in place

這些荷爾蒙使你的子宮內膜保持在適當的位置。

so it can nourish the pregnancy.

所以可以滋養孕期。

That's why you don't get your period

這就是為什麼你不來月經的原因。

when you're pregnant.

當你懷孕的時候。

But if sperm and egg don't meet up

但是，如果精子和卵子不相見的話

or a fertilized egg doesn't implant into your uterus,

或受精卵不能植入你的子宮。

the lining isn't needed

不需要內襯

and it flows out of your vagina.

並從你的陰道里流出來。

That's your period.

這是你的時期。

So it actually takes a lot of steps

所以其實需要很多步驟

and up to two - three weeks

和長達2-3周的時間

for pregnancy to happen.

為懷孕的發生。

Want to learn more about pregnancy?

想了解更多關於懷孕的知識嗎？

Check out PlannedParenthood.org

查看PlannedParenthood.org。