Your Baby is the size of a

Sesame Seed

If you didn’t know you were pregnant before this week, congratulations! Your little embryo already has a heart with four chambers and it’s been pumping blood for about a week, so it’s time to start taking Vitamin D and Folic Acid to aid their growth and development! It isn’t audibly discernable to you or your doctor, but the movement of it will show up on an ultrasound in a few weeks. You might be experiencing some pregnancy symptoms, like tender swollen boobs and light period cramps, but hang in there, the magic is taking place!

Week 5

Length : 0.04 in.

Weight : 0.003 oz.

Week 5
Length : 0.04 in.
Weight : 0.003 oz.

Your Baby is the size of a

Sesame Seed

If you didn’t know you were pregnant before this week, congratulations! Your little embryo already has a heart with four chambers and it’s been pumping blood for about a week, so it’s time to start taking Vitamin D and Folic Acid to aid their growth and development! It isn’t audibly discernable to you or your doctor, but the movement of it will show up on an ultrasound in a few weeks. You might be experiencing some pregnancy symptoms, like tender swollen boobs and light period cramps, but hang in there, the magic is taking place!

Your little sesame seedling already has a heart with four chambers, which begins pumping blood this week. It won't yet be audibly discernable to you or your doctor, but the movement of it would likely show up on an ultrasound by week six or seven.

By week five, the embryo is securely nestled into your uterine wall and divided into three cell layers: the ectoderm, the mesoderm, and the endoderm. The top layer of cells, the ectoderm, is where the hair, skin, tooth enamel, nails, and mammary and sweat glands will develop. The neural tube, which eventually forms the brain and spinal cord, will start to develop, too.

The mesoderm, or middle layer, will make the most impressive changes this week. The mesoderm is also responsible for developing muscles, cartilage, bone, placenta, and the umbilical cord. In the coming weeks, the bottom layer (called the endoderm) will eventually grow your baby's lungs, intestines, thyroid, pancreas, and early urinary system.

By now, the level of hCG in your urine should be high enough for a home test to detect (and confirm!) what you probably already expect - you're pregnant!

This week, you may feel... everything!

Happy, anxious, exhausted, depressed, scared, powerful, sexy, frumpy, if you can name it, you can feel it. It's like an amped-up PMS. As your hormones flare, your emotions generally do the same, reeling you about your day like a one-human soap opera. Mood swings are normal during pregnancy and are most intense during the first six months.

It's too early for you to have gained much weight, and even though the first month of pregnancy is behind you, you may still not feel pregnant. Furthermore, individuals who experience a lot of morning sickness may even lose some weight during the first month of pregnancy.

If you're experiencing morning sickness, some parents-to-be find it helps to eat six smaller, high-carb, high-protein meals (instead of three large meals). Other parents-to-be advise avoiding fatty foods and keeping saltine crackers in your bag for any spur-of-the-moment queasy attacks. If nausea and vomiting are keeping you from food right now, don't worry. Your little one doesn't need you to add extra calories to your diet yet. During the first trimester, the average weight gain is usually about three to five pounds.         

In week five, life tends to continue as it did before. You may not feel any different and wish you’d start feeling or looking pregnant, yearning for some symptom as proof of the life growing inside of you. Alternatively, you may be experiencing a few - or all - of the early pregnancy symptoms, mentioned below, yet wish to keep your symptoms and growing belly under wraps for as long as humanly possible.

Increased hCG levels: the pregnancy hormone, human chorionic gonadotropin (hCG), is responsible for setting your pregnancy in motion and will be present in both your urine and blood. This is what will result in a positive pregnancy test!

Morning Sickness, nausea, or vomiting: this notorious pregnancy symptom can vary drastically from pregnancy to pregnancy and despite the name may not be limited to the morning hours. Nausea may or may not be accompanied by vomiting and can be triggered by hunger, strong smells… or at times seemingly nothing at all. 

Food aversions: the evil twin of food cravings, food aversions may have you running from the hills when presented with certain menu items. Common culprits include foods with strong scents or unique textures such as meat, coffee, or eggs. 

Tender, swollen, sore, or tingling breasts: you may experience some sensitivity in your breasts and nipples as your body makes preparations for eventually producing breast milk. This process happens whether or not you decide to breastfeed and is just one example of how our amazing bodies are designed to care for our babies. 

Darkened areola: the colored portion around your nipple is called the areola and you may notice some slight (or significant) darkening during pregnancy. It is believed that this may occur to make the breasts easier for newborns to find. 

Cramps: often associated with your period, cramping may set off your internal alarm bells, thinking that something is wrong – but it can be a perfectly normal symptom as your body stretches and relaxes into its new role as a baby incubator. 

Spotting: it’s possible that you will notice some light spotting. This may be accompanied by some mild cramping, but the bleeding will generally be lighter in both volume and color without a consistent flow. If you're concerned, reach out to your midwife or healthcare practitioner.

Frequent urination: later in your pregnancy your growing baby will put pressure on your internal organs resulting in a need to empty your bladder more frequently. At this stage, however, your need to pee is a result of changing hormones. 

Constipation: the hormone progesterone relaxes your muscles, including those found in your digestive system. This is so your body will have time to absorb the nutrients needed for your growing baby but has the unfortunate side effect of making it more difficult to evacuate your bowels, which may result in some constipation. 

Fatigue: Making a baby is hard work! Even in the early weeks, you may find yourself exhausted. Be sure to listen to your body and get some rest whenever you can.

Metallic taste in mouth: this symptom is called dysgeusia. While generally not a concern during pregnancy it is worth noting to your medical care provider as it could signal an underlying health condition. Most likely though, it only means that some of your favorite foods may taste a little funky for a while. 

Mood Swings: hormone fluctuations may leave you feeling extreme emotions from joy to irritation; sometimes switching without warning. If your reactions seem to be irrational, know that your growing baby may be the explanation.

No Symptoms: early pregnancy is associated with a flood of symptoms as your body begins undergoing some drastic changes. However, some individuals may experience very few symptoms or even none at all!          

To combat the discomfort that is your abnormally tender breasts, invest in a proper jogging bra or bralette, which will feel more comfortable than the normal go-to underwire bra that you're probably growing out of.

When you have capacity, write down the details of your pregnancy, because the next months of your life will be filled with excitement, stress, trials, expectations, and plans for the future. From gear to choose and a nursery to prepare, to extra snacks and extra naps, channel your thoughts, wishes, and worries into a pregnancy journal or blog. 

For journal inspiration, look through pregnancy and baby sections at local bookstores. Some journals have designated spaces to record the details of doctor visits, symptoms, weight gain, and more. Other journals offer question prompts, or blank pages from cover to cover.

Check out other parents-to-be chronicling their lives via blogs on the Internet. You may even find unexpected joy in having an easy, accessible way to update friends and extended family members who want to check in on your progress and enjoy photos, expanding and strengthening your circle of love and support. Whether you use a journal as an outlet for your private thoughts or to stay in touch with distant family and friends, it's a great way to capture your personal memories and milestones.

Join a local pregnancy support group, online or in person, if you are feeling lonely, or lack support.

Drink a lot of water.

If you haven’t told your partner about the pregnancy, or if you haven't selected an OB or other pregnancy healthcare provider, now is the time to do so!         

At a Glance

  • Brain time: Your baby’s neural tube (the beginning of their brain and spinal cord) is beginning to form.
  • Eat safe: Foodborne illnesses such as listeria or toxoplasmosis in early pregnancy can be especially dangerous. Ask your medical care provider for a list of foods to avoid.
  • Start prenatals: Ensure you and your baby are getting the nutrients you need with a prenatal vitamin.
  • Not feeling pregnant: Not everyone has extreme pregnancy symptoms, and some individuals don’t experience symptoms until later!
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Louise Broadbridge

Expert Midwife

Hi, my name is Louise, I am a registered senior midwife, founder of Let's Talk Birth and Baby antenatal classes and the face behind instagram's The Honest Midwife. I have taught over 100,000 expectant parents since starting my antenatal classes which have 5* reviews.

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The information on the Your Baby Club website is not intended to be a substitute for professional medical advice, diagnosis or treatment. Always discuss any health concerns with a qualified healthcare provider and carefully review all guidance that comes with any medications or supplements before taking.