3 Weeks Pregnant – What To Expect In Week 3

3 Weeks Pregnant - What To Expect In Week 3

This is it! At 3 weeks pregnant, this is the magic week. Conception has occurred.

Last week sperm met egg and you made a baby!

It’s taken until now for the fertilised egg to travel to the uterus and begin to implant.

Here’s everything you need to know about being 3 weeks pregnant.

3 Weeks Pregnant

When you’re 3 weeks pregnant, it’s still very early.

You’re probably not aware the amazing process of conception and growing your baby is under way.

Conception happened only a few days ago and you haven’t had time to miss your next period.

3 Weeks Pregnant Belly

At this stage you won’t know you’re pregnant, but your body will.

Even so, you won’t get a positive pregnancy test result just yet.

First your body has to produce a hormone called Human Chorionic Gonadtrophin (HCG).

This happens when the fertilised egg implants in the uterus.

Home pregnancy tests detect HCG in your urine.

Some pregnancy tests are sensitive enough to pick up a positive result for the pregnancy hormone HCG one week after conception.

HCG encourages the ovaries to continue to produce progesterone.

This prevents your body shedding the lining of your uterus (and the fertilised egg).

Your immune system is also suppressed so your body won’t reject your baby as a foreign object.

Your ovaries produce progesterone for about 7 weeks or so, until the placenta takes over.

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3 Weeks Pregnant: Symptoms

At this stage pregnancy symptoms aren’t likely to have started yet.

Pregnancy hormones trigger early pregnancy symptoms, but the hormone levels aren’t yet high enough.

There are some signs you might notice over the coming weeks. They include:

  • Implantation bleeding. You might notice a very small amount of spotting or light bleeding which results from the fertilised egg burrowing into the uterus lining.
  • Nausea. As HCG levels start to rise you might notice a feeling of queasiness. Morning sickness isn’t well named as it can happen at any time of the day.
  • Tender breasts. Amazingly your breasts start to prepare for feeding your baby very early in pregnancy. This can cause them to feel sore and tender.
  • Vaginal discharge. Your body prepares to protect your baby by forming a mucus plug in the cervix. You might notice some discharge as this happens.

You might have none, some, or even all of these very early signs of pregnancy.

Every woman’s experience is different, but the two-week wait after conception can be a trying one.

3 Weeks Pregnant Ultrasound

It’s not common to have an ultrasound at 3 weeks pregnant, unless your doctor has concerns about ectopic pregnancy.

Usually one sperm fertilises the egg in the fallopian tube; the egg then moves down into the uterus.

Sometimes, though, it doesn’t move and continues to grow in the fallopian tube instead.

This is called an ectopic pregnancy, and it can be very serious and potentially life threatening.

Ectopic pregnancies are very rare, occurring in about 1% of pregnancies.

After it has been penetrated by the successful sperm, the egg begins to divide rapidly.

During its journey of around six or seven days, it continues to divide.

It then attaches itself to the uterine lining.

An estimated 50-60% of fertilised eggs never make it this far.

Once implanted, your tiny embryo begins the work of growing in earnest.

A yolk sac starts to form; this provides the first nutrients until the placenta takes over.

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Last Updated: January 19, 2019


Kelly Winder is the creator of BellyBelly.com.au, a writer, doula (trained in 2005), and a mother of three awesome children. She's passionate about informing and educating fellow thinking parents and parents-to-be, especially about all the things she wishes she knew before she had her firstborn. Kelly is also passionate about travel, tea, travel, and animal rights and welfare. And travel.

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