Week 3


Published : 19/03/2024

Last updated: 18/05/2024

Guess what? You’ve just hit a major milestone: fertilization! Yep, that means you’re officially pregnant—although you might not realize it just yet.


What comes next? Implantation! If you see a little spotting/bleeding, it could be the embryo nestling into your uterus. But don’t worry if you don’t notice anything—some women don’t have any bleeding, or they might mistake it for their period.


If you’ve been trying to conceive, you’ve likely already started making some lifestyle tweaks. If not, now’s a great time to start. Remember to take your prenatal vitamins, keep up with moderate exercise, and steer clear of alcohol.


Last week, sperm met egg, and ta-da—you’ve created a baby! It’s still super early, though, so at 3 weeks pregnant, you might not even realize you’re pregnant yet. Conception just happened a few days ago, so it’s probably too soon for you to miss a period.

Pregnancy week 3 Quick Facts

  • At three weeks, you’re in your first month of pregnancy
  • You have 37 weeks to go
  • You’re in the first trimester

Your body at 3 weeks pregnant

Early Pregnancy Hormones:

Right now, the cells gearing up to form the placenta and are busy producing a hormone called hCG. This hormone signals your ovaries to take a break from releasing eggs and to keep pumping out progesterone. Progesterone helps maintain the lining of your uterus, keeping it cozy for your tiny passenger. Once there’s enough hCG in your pee, you’ll see that positive pregnancy test result you’ve been waiting for!


Amniotic Fluid:

Inside your womb, amniotic fluid is starting to gather within the Amniotic Sac. This fluid is like a cushy blanket for your baby, providing protection in the weeks and months to come. And hey, if your water breaks before or during labor, that’s actually this same fluid making its grand entrance!

Your Unborn Baby’s Size at 3 Weeks

Do you know when ovulation happens? It’s about 14 days since the starting of your last menstrual period. After you’ve ovulated, your egg makes its way into your fallopian tube. Human eggs are extremely tiny, about 0.1 mm in diameter, or about the size of a pencil-point (0.2).


The egg is transported from the ovaries into the fallopian tube. There, it waits for sperm to fertilize it. Your egg is only capable of being fertilized for about 12 to 24 hours.


After this time, your egg is swept through the fallopian tube by tiny cilia. If conception has occurred, your fertilized egg will implant in your uterine lining about five to six days after fertilization.

Pregnancy Symptoms at Week 3

At the onset of the third week of pregnancy, symptoms may not yet manifest. This can be attributed to the gradual accumulation of pregnancy hormones within the body. Rest assured, these hormonal changes will intensify in due time. Below are some indicators that may begin to emerge around the third week and in subsequent weeks:


Implantation bleeding

During this week, you might experience some light bleeding, known as implantation bleeding, which occurs when the fertilized egg implants into the lining of your uterus. Unlike a regular period, this bleeding is typically lighter and lasts only for one to three days. However, if you experience bleeding accompanied by pain, it’s crucial to contact your healthcare provider promptly, as this could indicate a potential ectopic pregnancy (implantation outside the main cavity of the uterus).



As the pregnancy hormone hCG starts circulating in your newly pregnant body, you might experience nausea, commonly known as morning sickness. However, it’s worth noting that morning sickness doesn’t necessarily stick to mornings – it can occur at any time of the day. Experiencing this symptom could indicate that you’re further along in your pregnancy than anticipated. Additionally, if you’re carrying twins, you may have higher levels of pregnancy hormones, leading to more severe nausea.


Breast changes

Early in pregnancy, many women experience breast tenderness similar to premenstrual discomfort, but often more pronounced. This can include sensations of swelling, tenderness, and tingling, with heightened sensitivity in the nipples. Additionally, as pregnancy progresses, you may observe darkening of the nipples, signaling the body’s preparation for milk production.

Missed period

If your menstrual cycle is shorter than 28 days, you might start considering the possibility of pregnancy towards the end of this week. To confirm whether you’re pregnant or not, the most reliable method is to take a pregnancy test.


Gas and bloating

During pregnancy, the hormone progesterone relaxes muscles, including those in your digestive tract, slowing down digestion and causing gas and bloating. Around half of pregnant women experience constipation at some stage. To alleviate this, maintain hydration and consume fiber-rich foods such as whole grains, fruits, and vegetables to promote regular bowel movements


Basal body temperature stays high

To track your temperature accurately, continue using a basal body thermometer. Measure your temperature each morning before getting out of bed to ensure consistency.


Frequent urination

Frequent urination is a common early pregnancy symptom, primarily due to hormonal changes and the pressure exerted on the bladder as the uterus expands to accommodate the growing fetus. Additionally, increased blood production during pregnancy leads to heightened kidney activity, resulting in more frequent bathroom trips. While generally normal, if accompanied by pain or discomfort, it’s important to consult a healthcare provider to rule out urinary tract infections or other complications.

Tips for Week 3

Hey there, if you’re in the early stages of trying to have a baby, it can feel like a rollercoaster of emotions! Here are some simple tips to help you stay healthy and calm during this time:

Patience is Key:

It’s tempting to take a pregnancy test right away, but hold off until the end of the week. Sometimes it takes a bit for the test to detect pregnancy. If it’s negative, don’t worry, just keep testing every few days until your period arrives.

Take the Test Right:

When you do take the pregnancy test, do it in the morning with your first pee. This pee is super concentrated and gives the best chance of accurate results. Follow the test instructions carefully.

Keep Up with Self-care:

Keep taking those prenatal vitamins, drink lots of water, and eat healthy meals. Moderate exercise and some self-care practices can also help you feel good.

Eat Well:

Focus on foods rich in calcium and iron to support your body as it changes. If you’re feeling queasy, try ginger tea, clear broth, or even a banana. Ice cream can be a treat that also gives you some of the nutrients you need.

Remember, this is an exciting time, so take care of yourself and enjoy the journey!

A Gentle Nudge from Mammas Journey

Well, dear, your roller coaster journey is about to begin! So, tighten your seat belt and get ready for this amazing ride. This is the time you will start noticing the symptoms, or if you don’t, it’s okay!


Everyone’s journey is not the same. Some may not notice any change at all. That doesn’t mean you are not pregnant. Get a test kit, find out the result.

Take good care of yourself, don’t skip medicines, eat healthy, and rest!

Scroll to Top