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4
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This week highlights

It's a date!

Our calculator can determine your due date based on the date of your last menstrual cycle or the date of conception.

The embryonic stage begins

本周一,研究小组表示,根据遗骨可以看出,理查三世患有严重的脊柱侧弯,或者说脊柱弯曲。这会让他十分痛苦,还会导致右肩比左肩高,但莎士比亚的《理查三世》中描述的枯萎的手臂却无从证实。
在过去三年里,夏威夷航空公司的航班延误率只有6.92%,几乎是排名第二的阿拉斯加航空公司的一半——这家公司的航班延误率达到11.27%。

Consider carrier screening

It's a simple blood or saliva test to see whether your baby is at risk for any genetic disorders, such as cystic fibrosis or sickle cell disease.

36 weeks to go!

You're in your first month

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Baby development at 4 weeks

Your little embryo

北极和南极海冰量均降至历史最低水平
Total Program Cost: $118,000
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embryo made up of hypoblast and epiblast
Your baby at 4 weeks Tap the plus for more details
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Your baby is about the size of a poppy seed

poppy seed

Primitive placenta

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The Internet users posted screenshots from social networking apps showing questions and answers that were going to be on the exam.

embryo in uterus at 4 weeks
Your body at 4 weeks Tap the plus for more details

Amniotic sac and yolk sac

腾讯通过电子邮件表示,目前没有为微信寻找赢利模式的计划。作为一个多元化互联网企业,腾讯拥有650亿美元左右的市值,是中国最大的上市互联网公司。旗下游戏产品、虚拟产品和其他平台上的广告给它带来了强劲的收入流。
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See what fraternal twins look like in the womb this week.

Pregnancy symptoms during week 4

No symptoms?

Don't worry. Many women don't feel anything yet this week. In fact, most early pregnancy symptoms don't start until about 6 weeks.

Tender, swollen breasts

Breast tenderness can be one of the earliest signs of pregnancy. It usually starts around 4 to 6 weeks and lasts through the first trimester.

Fatigue

For many women, exhaustion is one of the first signs of pregnancy. But other women hardly seem to slow down at all.

Nausea or vomiting

Morning sickness can strike at any time of day. It usually starts around 6 weeks of pregnancy but can begin as early as 4 weeks. Some women have cramping as well.

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If you've been charting your temperature and it stays elevated for 18 days in a row, you're probably pregnant.

Pregnancy checklist at 4 weeks pregnant

Take a pregnancy test

If you haven't already, you should be able to find out whether you're pregnant. For the most accurate results, wait until a few days after you miss your period before you take a pregnancy test.

Make a prenatal appointment

If the test is positive, call your doctor or midwife and schedule your first prenatal appointment. In the meantime, you can calculate your due date, but remember that it's just an estimate. You're just as likely to go into labor any day during the two weeks before or after.

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If you've been trying to conceive with no success for a year or more (or for six months if you're over 35), talk to your healthcare provider about a workup for you and your partner to spot possible fertility problems.

4 weeks pregnant bellies

This week's video

Kate Marple is an award-winning journalist with more than 25 years of experience writing and editing health content.   
 
 
 
POLL

How many positive pregnancy tests did you need before you believed the news?

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