Having a baby two weeks early

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How your baby will growYou're not pregnant yet, but you may be about to release an egg that could grow into a baby if it's fertilized by your partner's sperm.Last week an increase in the amount of estrogen and progesterone coursing through your bloodstream prompted your uterus to form a lush, blood-rich lining of tissue to support a potential fertilized egg.
Track your baby's development Get expert guidance from the world's #1 pregnancy and parenting resource, delivered via email, our apps and website. The blastocyst that will be your baby splits to form the placenta and the embryo and the specialized parts of your baby's body begin to develop. While you may be suspecting you're pregnant and trying to estimate your due date, your baby has already found its home: The blastocyst that will develop into your baby has completed its six-day journey from your fallopian tube to your uterus. The fertilized egg and your uterus are making contact this week, as the blastocyst you'll one day call your baby begins to attach itself to the uterine lining. It can take 2 to 3 weeks after a missed period before you produce enough pregnancy hormones to be detected on a test.
Consider these two weeks of waiting as a final walk-through before the baby takes over the keys. While the amniotic sac (also called the bag of waters) forms around it, so does the yolk sac (don't worry, you're not having a chicken), which will later be incorporated into your baby's developing digestive tract. At 4 weeks pregnant, your body's busily gearing up, big time — transforming from a reliable buddy to a weird and wacky science experiment.
HCG alerts the corpus luteum (the once-follicle this egg was released from) that it needs to stick around and produce progesterone to nourish the pregnancy until the placenta takes over — about six weeks from now. By the end of week 2 your ovary will release an egg into the fallopian tube and it will meet its fate.

Get to it and learn about genetic, environmental and lifestyle hazards that may put your fertility and baby at risk. As soon as that little ball of cells is settled in its new home, it will undergo the great divide — splitting into two groups.
And the embryo now has three distinct layers of cells that will grow into specialized parts of your baby's body. Doing the math is actually a lot easier than you think (even if you slept through high school algebra): Your estimated due date is 40 weeks from the first day of your last period. Half (now called the embryo) will become your son or daughter, while the other half forms the placenta, your baby's lifeline — the lifeline that channels nutrients to your baby and carries waste away until delivery.
The inner layer, known as the endoderm, will develop into your baby's digestive system, liver and lungs. Whatever you're feeling (or not feeling), it's likely still too early to see a reliable result on your pregnancy test. Likewise, your egg can be kept waiting for a day or two for tardy sperm to make their appearance. Estrogen does two things: First, it encourages the lining of the uterus to begin thickening again. While you may be suspecting you’re pregnant and trying estimate your due date, your baby has already found its home. The middle layer, called the mesoderm, will soon be your baby's heart, sex organs, bones, kidneys and muscles. The outer layer or ectoderm, will eventually form your baby's nervous system, hair, skin and eyes.

If you do give birth on that day, your baby will have clocked in only 38 weeks in utero, not 40.
That's because pregnancy counting begins two weeks before your baby is even conceived (making you about 4 weeks pregnant before you can tell you're expecting from a pregnancy test). Early pregnancy symptoms are sort of like PMS symptoms but a little more exaggerated (think PMS on steroids).
Think of it as a head start — you're clocking in roughly two weeks of pregnancy before you even conceive!
Right — the lucky sperm that will turn that eager egg into a baby-in-the-making and make your body's prep work worth all the effort. Our information is designed to give you a general idea of your baby's development.How your life's changingYour last period started about two weeks ago, so you're probably ovulating now or will be soon. It could be about two weeks or more before you can get a positive pregnancy test result if you succeed in conceiving.Most babies are born about 38 weeks after the egg is fertilized, but since it's often difficult to pinpoint exactly when egg and sperm merged, your healthcare provider calculates your due date by counting 40 weeks from the first day of your last period. Most babies are born between 38 and 42 weeks (with babies of first-time moms more likely to arrive on the later side); only a handful actually makes their debut right on schedule.

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