During the first three months of pregnancy, or the first trimester, your body undergoes many changes. As your
body adjusts to the growing baby, you may have nausea, fatigue, backaches, mood swings, and stress. These things are all normal.
The following has been adapted from the National Women's Health Information Center website.
Most of these discomforts will go away as your pregnancy progresses. And some women might not feel any discomfort at all! If you have been pregnant before, you might feel differently this time around. Just
as each woman is different, so is each pregnancy.
As your body changes, you might need to make changes to your normal, everyday routine. Here are some of the most common changes or symptoms you might experience in the first trimester:
Tiredness
Many women find they're exhausted in the first trimester. Don't worry, this is normal. This is your body's way of telling you that you need more rest. After all, your body is working very hard to
develop a whole new life.
Try these tips to ease exhaustion:
- Get at least eight hours of sleep every night, and a nap during the day when possible.
- When you are tired, rest or relax.
- Start sleeping on your left side. This will relieve pressure on major blood vessels that supply oxygen and nutrients to the fetus. If you have high blood pressure during pregnancy,
it is even more important to be on your left side when you are lying down.
- If you feel stressed, try to find a way to relax.
Nausea and Vomiting
Usually called "morning sickness," nausea and vomiting are common during early pregnancy. For many women, though, it is not limited to just the morning. Although it can seem like it will last
forever, nausea and vomiting usually go away after the first trimester. For additional information please visit the morning sickness link.
If you think you might be vomiting excessively, call your doctor. If you lose too much fluid you might become dehydrated. Dehydration can be dangerous for you and your baby.
For some women, the nausea of the first trimester is so severe that they become malnourished and dehydrated. These women may have a condition called hyperemesis gravidarum (HG). HG refers to women who are
constantly nauseated and/or vomit several times everyday for the first 3 or 4 months of pregnant. HG keeps pregnant women from drinking enough fluids and eating enough food to stay healthy. Usually,
women with HG begin to feel better by the 20th week of pregnancy. But some women vomit and feel nauseated throughout all three trimesters. Visit the Hyperemesis Education and Research (HER) Foundation Web Site for more detailed information on HG.
Frequency of Urination
Early in pregnancy, the growing uterus presses on your bladder. This causes frequent urination. See your doctor right away if you notice pain, burning, pus or blood
in your urine. You might have a urinary tract infection that needs treatment.
Weight gain
During the first trimester, it is normal to gain only a small amount of weight, about one pound per month.
Changes in your baby
By the end of the first trimester, your baby is about three inches long and weighs about half an ounce. The eyes move closer together into their positions, and the ears also are in position. The liver is
making bile, and the kidneys are secreting urine into the bladder. Even though you can not feel your baby move yet, your baby will move inside you in response
to pushing on your abdomen.
Medical care and prenatal care
During the early months of pregnancy, regular doctor or midwife visits ( prenatal care) are especially important. During the first prenatal
visit, you can expect your doctor or midwife to do the following:
- ask about your health history including diseases, operations, or prior pregnancies
- ask about your family's health history
- do a complete physical exam
- do a pelvic exam with a Pap test
- order lab tests
- check your blood pressure, urine, and weight
- figure out your expected due date
- answer your questions
More 1st Trimester Tests and Procedures Care Information
For special genetic or medical reasons, you may need other lab tests, like blood or urine tests, cultures for infections, or ultrasound exams in the first trimester. Your doctor or midwife will discuss
them with you during your visits.
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The following, adapted from the above Mayo Clinic website, will give
you an idea of what is happening during your first 12 weeks of your pregnancy.
Week 1: Getting ready
It may seem strange, but you' are re not actually pregnant the first week or two of the time allotted to your pregnancy. Conception typically occurs about two weeks after your period begins. To calculate
your due date, your health care provider will count ahead 40 weeks from the start of your last period. This means your period is counted as part of your pregnancy even though you were not pregnant at the
time.
Week 2: Fertilization
The sperm and egg unite in the fallopian tube to form a one-celled entity called a zygote. If more than one egg is released and fertilized, you may have multiple zygotes. The zygote has 46 chromosomes,
23 from the egg and 23 from the sperm. These chromosomes contain genetic material that will determine your baby's sex and traits such as eye color, hair color, height, facial features and, at least to some
extent,intelligence and personality.
Soon after fertilization, the zygote will travel down one of your fallopian tubes toward the uterus. At the same time, it will begin dividing rapidly to form a cluster of cells resembling a tiny raspberry.
The inner group of cells will become the embryo. The outer group of cells will become the membranes that nourish and protect it.
Week 3: Implantation
By this time the zygote is made up of about 500 cells and is now known as a blastocyst. When it reaches your uterus, the blastocyst will burrow into the uterine wall for nourishment. The placenta, which
will nourish your baby throughout the pregnancy, also begins to form. By the end of this week, you may test positive in a pregnancy test.
Week 4: The embryonic period begins
The fourth week marks the beginning of the embryonic period, when the baby's brain, spinal cord, heart and other organs begin to form. Your baby is now 1/25 of an inch long.
The embryo is now made of three layers. The top layer, the ectoderm, will give rise to a groove along the midline of your baby's body. This will become the neural tube, where your baby's brain, spinal cord,
spinal nerves and backbone will develop.
Your baby's heart and a primitive circulatory system will form in the middle layer of cells, the mesoderm. This layer of cells will also serve as the foundation for your baby's bones, muscles, kidneys and
much of the reproductive system.
The inner layer of cells, the endoderm, will become a simple tube lined with mucous membranes. Your baby's lungs, intestines and bladder will develop here.
Week 5: Baby's heart begins to beat
At week five, your baby is 1/17 of an inch long, about the size of the tip of a pen.
This week, your baby's heart and circulatory system are taking shape. Your baby's blood vessels will complete a circuit, and his or her heart will begin to beat. Although you will not be able to hear it
yet, the motion of your baby's beating heart may be detected with an ultrasound exam.
With these changes, circulation begins, making the circulatory system the first functioning organ system.
Week 6: The neural tube closes
Growth is rapid this week. Just four weeks after conception, your baby is about 1/8 of an inch long. The neural tube along your baby's back is now closed, and your baby's heart is beating with a regular
rhythm.
Basic facial features will begin to appear, including an opening for the mouth and passageways that will make up the inner ear. The digestive and respiratory systems begin to form as well.
Small blocks of tissue that will form your baby's connective tissue, ribs and muscles are developing along your baby's midline. Small buds will soon grow into arms and legs.
Week 7: The umbilical cord appears
Seven weeks into your pregnancy, your baby is 1/3 of an inch long, a little bigger than the top of a pencil eraser. He/she weighs less than an aspirin tablet.
The umbilical cord is the link between your baby and the placenta and it is now clearly visible. The cavities and passages needed to circulate spinal fluid in your baby's brain have formed, but your baby's
skull is still transparent.
The arm bud that sprouted last week now resembles a tiny paddle. Your baby's face takes on more definition this week, as a mouth perforation, tiny nostrils and ear indentations become visible.
Week 8: Baby's fingers and toes form
Eight weeks into your pregnancy, your baby is just over 1/2 of an inch long.
Your baby will develop webbed fingers and toes this week. Wrists, elbows and ankles are clearly visible, and your baby's eyelids are beginning to form. The ears, upper lip and tip of the nose also become
recognizable.
As your baby's heart becomes more fully developed, it will pump at 150 beats a minute, about twice the usual adult rate.
Week 9: Movement begins
Your baby is now nearly 1 inch long and weighs a bit less than 1/8 of an ounce. The embryonic tail at the bottom of your baby's spinal cord is shrinking, helping him or her look less like a tadpole and
more like a developing person.
Your baby's head, which is nearly half the size of his or her entire body, is now tucked down onto the chest. Nipples and hair follicles begin to form. Your baby's pancreas, bile ducts, gallbladder and
anus are in place. The internal reproductive organs, such as testes or ovaries, start to develop.
Your baby may begin moving this week, but you will not be able to feel for it quite a while yet.
Week 10: Neurons multiply
By now, your baby's vital organs have a solid foundation. The embryonic tail has disappeared completely, and your baby has fully separated fingers and toes. The bones of your baby's skeleton begin to form.
This week, your baby's brain will produce almost 250,000 new neurons every minute.
Your baby's eyelids are no longer transparent. The outer ears are starting to assume their final form, and tooth buds are forming as well. If your baby is a boy, his testes will start producing the male
hormone testosterone.
Week 11: Baby's sex may be apparent
From now until your 20th week of pregnancy, the halfway mark, your baby will increase his or her weight 30 times and will about triple in length. To make sure your baby gets enough nutrients, the blood
vessels in your placenta are growing larger and multiplying.
Your baby is now officially described as a fetus. Your baby's ears are moving up and to the side of the head this week. By the end of the week, your baby's external genitalia will develop into a recognizable
penis or clitoris and labia majora.
Week 12: Baby's fingernails and toenails appear
Twelve weeks into your pregnancy, your baby is nearly 3 inches long and weighs about 4/5 of an ounce.
This week marks the arrival of fingernails and toenails. Your baby's chin and nose will become more refined as well.
Taking care of your baby
Do:
Take a prenatal vitamin or folic acid supplement.
Maintain a healthy weight.
Exercise regularly, with your health care provider's OK
Eat healthfully.
Manage stress and any chronic health conditions.
See your health care provider for regular prenatal checkups.
Talk to your health care provider about any medications you're taking.
Do not:
Smoke..
Drink alcohol.
Take medication, herbs, or vitamins without checking with your health care provider.
Use recreational drugs.
For more information about pregnancy do's and don'ts, click on this pregnancy do's and don'ts link.
Click on the highlighted links in this paragraph for more information about the 2nd trimester and the 3rd
trimester of your pregnancy. |
