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What to Expect in the 6th Week of Pregnancy

With a degree in biochemistry, Leah works for a small biotechnology company and enjoys writing about science.

The Embryo at Six Weeks

The embryo develops in a big way at six weeks of pregnancy: the umbilical cord forms, the optic pit (future eye) forms, and the baby's heart begins to beat!

The embryo develops in a big way at six weeks of pregnancy: the umbilical cord forms, the optic pit (future eye) forms, and the baby's heart begins to beat!

Your Pregnancy at Six Weeks

If morning sickness was not a problem in the first few weeks of pregnancy, it may arrive with a vengeance during the sixth week. Hormone levels are rising rapidly and the increased levels of estrogen and progesterone make many women queasy at this point in the pregnancy. Fatigue may also reach epic proportions, causing many women to struggle to get through the day without a nap.

The baby develops rapidly during the sixth week, and a fetal heartbeat may be seen on ultrasound during this week. Some women will receive a "viability" ultrasound to confirm the baby is developing on track and the little heart has begun to beat.

How to Deal with Morning Sickness

Pregnancy Symptoms at Six Weeks

Early pregnancy symptoms may include:

  • Bloating as the uterus begins to expand.
  • Aching breasts.
  • Nausea and vomiting ("morning sickness").
  • Fatigue.
  • Frequent urination.
  • Itching skin over the abdomen.
  • Mood swings and irritability.

Nausea can be helped by eating small, bland meals throughout the day. Crackers and nuts help many women get through this phase of pregnancy. Other natural morning sickness remedies include ginger, mint tea, and Emetrol (a sugary anti-nausea formulation that is safe during pregnancy). Take heart: most women who experience morning sickness will find relief once they enter the second trimester, at around the 12th or 13th week of pregnancy.

The "Rubber Band" Trick for Pants in Pregnancy

Use a rubber band and loop it through the button-hole. This gives a little more room in the waist-band for those who aren't quite ready for maternity pants, but have bloating in early pregnancy!

Use a rubber band and loop it through the button-hole. This gives a little more room in the waist-band for those who aren't quite ready for maternity pants, but have bloating in early pregnancy!

The Baby's Development at Six Weeks

The baby develops very quickly at this gestational age. Four weeks old from the time of conception, the baby is now 1/4" long. The baby now has a head and a tail: baby is curved into a C shape as the baby's back is growing more rapidly than his or her front. The heart starts to beat, circulating blood cells produced by the yolk sac. Baby's heart rate is nearly twice an adult's rate: the fetal heart beats at 100-160 beats per minute! The baby's heart only contains two of four chambers.

Arches appear on the baby's head, and these will form the airways and jaw. The small passage to the baby's inner ear is also forming this week. While they can't be seen by ultrasound just yet, very tiny buds that will become arms and legs develop toward the end of this week.

The other big news this week: the umbilical cord begins developing!

Six Weeks Pregnant: Baby's Size

The baby is approximately 1/4" in length, or about the size of the confetti sprinkles seen in this picture. A quarter is used for size reference.

The baby is approximately 1/4" in length, or about the size of the confetti sprinkles seen in this picture. A quarter is used for size reference.

Viability or Dating Ultrasounds

Sometimes, women who have concerns about their pregnancy will be given a "viability" ultrasound. Some offices perform this scan routinely at approximately 6-8 weeks of pregnancy. This scan allows the doctor to:

  • Verify a healthy pregnancy and fetal heart beat.
  • Measure the size of the baby.
  • Confirm the expected gestational age of the baby.

Measurements taken early in pregnancy are very accurate at determining the baby's gestational age. All babies grow at approximately the same rate at this stage, so dating ultrasounds are generally done early in pregnancy. In late pregnancy, babies' growth rates vary considerably and are less reliable for dating a pregnancy.

Ultrasound with Heart Beat at Six Weeks

The First Doctor's Appointment

Even if a viability ultrasound is not performed this week, many women will have their first doctor's appointment sometime between 6-8 weeks of pregnancy. Some offices have women come in to fill out paperwork and receive an estimated due date based on the first day of the last menstrual cycle before booking an official appointment.

The first visit to the obstetrician will generally include a urinalysis, pelvic exam, pap smear if one hasn't been performed within the year, blood work, and a chance to talk to the doctor about your medical history, concerns, and questions.

Be honest on all medical questionnaires. The doctor needs information on any past diseases, medical procedures, and pregnancies to care for the baby appropriately. Risk factors are determined at the first appointment and monitoring of the pregnancy may be increased if deemed necessary.

Tests at the First Doctor's Visit

Test TypeUrine/BloodWhat the Doctor is Looking For

Glucose Strip


Early signs of gestational diabetes



Early signs of pre-eclampsia

Blood Type


Information for the medical file

Rh Factor


Verify no Rh incompatibility is present

Infectious Diseases


Testing for sexually transmitted diseases and immunity to diseases like Rubella

What Is a High-Risk Pregnancy?

Some women are alarmed to hear their pregnancy is labeled as high risk. There are many reasons a pregnancy may be labeled with this term, including:

  • Advanced maternal age.
  • Gestational diabetes.
  • Pregnancy with multiples (twins or more).
  • Previous pregnancy complications like premature rupture of membranes leading to premature birth.
  • Blood clotting disorders like Factor V Leiden.
  • Anatomical uterine anomalies, like bicornuate uterus.

While receiving this label may be frightening, it does mean that your doctor will pay closer attention to ensure the best outcome for you and your baby. Additional tests may be performed, and you may receive more ultrasounds than a low-risk pregnancy. Mothers with gestational diabetes will have their blood sugar monitored and may require insulin, and those with blood clotting disorders may receive anti-coagulants to ensure a healthy pregnancy.

Women may be shocked when they receive the "advanced maternal age" label, which applies to anyone who will deliver a baby at the age of 35 or older. The risk of chromosomal abnormalities does increase as a woman ages, but the risk does not jump overnight. Women may opt for additional testing (such as amniocentesis or chorionic villus sampling) if an early ultrasound or blood work reveals a high risk for genetic problems. Many women who elect for the extra testing do so to be prepared: the test results can give parents the ability to adjust to a diagnosis before birth. In addition, most of the time, the extra testing reveals a healthy pregnancy and the mother can breathe a sigh of relief without worrying for the next seven and a half months.

Ultrasound Poll

This content is accurate and true to the best of the author’s knowledge and does not substitute for diagnosis, prognosis, treatment, prescription, and/or dietary advice from a licensed health professional. Drugs, supplements, and natural remedies may have dangerous side effects. If pregnant or nursing, consult with a qualified provider on an individual basis. Seek immediate help if you are experiencing a medical emergency.

Questions & Answers

Question: Why did my hCG not double in 48 hours during the 5th week of pregnancy?

Answer: There are a few reasons for a failure of the hCG level to double in early pregnancy, including an impending miscarriage or ectopic pregnancy. A physician's examination is required to determine why your hCG levels are not doubling as expected.

Question: How do you test to see if hCG is doubling?

Answer: The best way to test the concentration of hCG is to see your doctor and have a beta hCG test ordered. This is a blood test that will give a quantitative number that can be monitored over time to tell the rate of increase. Urine pregnancy tests are qualitative, which simply tells you if you are "positive" or "negative," but cannot give a concentration of hCG.


Leah Lefler (author) from Western New York on September 09, 2017:

A good doctor (obstetrician) and proper diet are definitely crucial, kellyks! I have two very happy children and remember the early pregnancy days very well. The "morning" sickness was really the most difficult, and best helped with small protein snacks throughout the day.

kellyks on September 07, 2017:

Hi dear. I am very happy that you are asking the question on a public platform. The first thing you need in that period is the support of your husband. My husband is the biggest support in my life and I hope your husband is also like that. The other thing you need is a consultation of a good gynecologist. I am blessed to have consulted with one of the best gynecologist from Ukraine in that period. He listened to all my problems and his tips helped me a lot during those days of pregnancy. The next thing you should look at is proper diet. You must eat food containing rich iron which will increase your hemoglobin level. You can read books, listen to music and be as much stress-free as possible as it can harm your baby. You can play some small games to carry the blood circulation in the body. I hope my tips will help you and you will give birth to a bright and beautiful baby. Good luck and stay blessed.

Leah Lefler (author) from Western New York on October 29, 2012:

Goodness, I remember being so uncomfortable during the last weeks of pregnancy - even my maternity pants wouldn't fit! It is a vital trick, Teaches12345. The rubber band trick works well at the beginning - and end - of pregnancy!

Dianna Mendez on October 25, 2012:

Leah, the rubber band photo reminded me of my pregnancy. Yes, I had to resort to this method during my last few months. Keep up the great writing!