While your baby grows at a dizzying pace in your uterus, you may be growing more aware of pregnancy-related discomforts, including fatigue, achy or swollen breasts, nausea, and the need to pee more often.
There are no hard and fast rules about when to announce your pregnancy. Many expecting parents wait until late in the first trimester, but it's up to you. Some couples announce pregnancy right away to close friends and family members, but wait to tell their coworkers and broader community.
The likelihood of twins is about 3 out of 100 for most people, but chances are as high as 30 percent if you had in vitro fertilization. Women typically discover they're having more than one baby during an ultrasound in the first trimester. Or, your healthcare provider may hear more than one heartbeat with a handheld Doppler.
You're in your second month!
Deep in your uterus your tiny embryo is growing at a furious pace and looks more like a tadpole than a human. Your embryo is now made up of three layers – the ectoderm, the mesoderm, and the endoderm – which will later form all of the organs and tissues.
Your baby's brain, spinal cord, and nerves form from the neural tube, which is starting to develop from the top layer – the ectoderm. This layer will also give rise to skin, hair, nails, mammary and sweat glands, and tooth enamel.
The heart and circulatory system begin to form in the middle layer, or mesoderm. (This week, in fact, the tiny heart begins to beat and pump blood.) The mesoderm will also form your baby's muscles, cartilage, bone, and the tissue under the skin.
The third layer, or endoderm, will become the lungs, intestines, and early urinary system, as well as the thyroid, liver, and pancreas. In the meantime, the primitive placenta and umbilical cord, which deliver nourishment and oxygen to your baby, are already on the job.
Pregnancy hormones plus your body’s increasing blood volume may equal a near-constant need to pee. During pregnancy, running to the bathroom much more than you'd like is a fact of life. It’s important to stay hydrated, but you may want to cut back on fluids late in the day so you don’t have to get up to pee as frequently at night.
Breast tenderness is often one of the earliest signs of pregnancy. Increased hormone levels boost blood flow, which may make your breasts feel swollen, sore, tingly, and unusually sensitive to touch.
No one knows for sure what causes bone-crushing exhaustion in early pregnancy, but it's likely that hormonal changes are to blame. Most women find that their energy returns in the second trimester. Until then, try to get more sleep, lighten your load, ask others for help, and take good care of yourself.
Morning sickness – also called nausea and vomiting of pregnancy – affects different expecting moms at different times (and some not at all). It usually starts around week 5 or 6 of pregnancy. For some women, that telltale queasy feeling is one of the first giveaways that they're pregnant. There are safe ways to get relief from morning sickness, including changes to your diet and lifestyle, natural remedies, and medication. Be sure to talk to your provider if you're suffering.
Does the smell of your partner’s lunch suddenly make your stomach churn? Food aversions often start around now. Most expecting moms experience them, thanks to changing hormones and heightened senses. Some of the most common aversions include meat, coffee, eggs, dairy, and foods with a lot of spices or fat. To cope, try eating bland or cold foods. If cooking makes you sick, ask a loved one to cook for you or get takeout.
Wondering about a symptom you have? Find it on our pregnancy symptoms page .
If you already have a doctor or midwife you love, you're set. If not, start doing some research. Talk to friends and relatives, ask one of your other providers to recommend someone, check out the preferred providers under your health insurance plan, or search online. Find out more about what to consider when choosing a doctor or midwife.
Talk to relatives on both sides about your families' medical histories. Your provider will want to know whether any chronic conditions or genetic abnormalities run in either of your families.
For expert pregnancy info, helpful tools, and detailed fetal development images, download BabyCenter's free pregnancy and baby app.
If you haven't started taking a prenatal vitamin yet, now's the time to start. It's particularly critical to get enough folic acid now, because it greatly reduces your baby's risk of developing neural tube birth defects such as spina bifida.
Studies have linked high caffeine consumption to miscarriage and other pregnancy problems. That's why the American College of Obstetricians and Gynecologists advises expectant moms to limit their caffeine intake to less than 200 mg per day (that's about one cup of coffee).
At 5 weeks pregnant, your belly may be starting to look slightly different – perhaps like you had a big lunch. Or, you may not see any changes yet. There's no one-size-fits-all formula for how women show during pregnancy.
During the first trimester, nausea and vomiting may keep you from feeling like eating much. That's fine: your baby is tiny at this point, and you don't need to eat any extra calories. It's typical to gain about 3 to 5 pounds in the first trimester (and it's okay if you don't gain any weight at all).
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ACOG. 2020. How your fetus grows during pregnancy. American College of Obstetricians and Gynecologists. https://www.acog.org/womens-health/faqs/how-your-fetus-grows-during-pregnancy [Accessed June 2021]
CDC. 2021. During pregnancy. U.S. Centers for Disease Control and Prevention. https://www.cdc.gov/pregnancy/during.html [Accessed June 2021]
Mayo Clinic. 2019. Symptoms of pregnancy: What happens first. https://www.mayoclinic.org/healthy-lifestyle/getting-pregnant/in-depth/symptoms-of-pregnancy/art-20043853 [Accessed June 2021]
MedlinePlus (ADAM). 2021. Fetal development. https://medlineplus.gov/ency/article/002398.htm [Accessed June 2021]
NIH. 2017. What are some common signs of pregnancy? National Institute of Child Health and Human Development, National Institutes of Health. https://www.nichd.nih.gov/health/topics/pregnancy/conditioninfo/signs [Accessed June 2021]