3 Weeks Pregnant – What To Expect

3 Weeks Pregnant - What To Expect

3 Weeks Pregnant – What To Expect

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

Of 250 million sperm released when your partner ejaculates, only about 200 actually make it to the egg.

It’s long been believed sperm compete with each other to reach the egg.

But scientists are now discovering the possibility sperm cooperate to move collectively.

So the more sperm your partner makes, the more mobility the sperm has.

This, the greater the chances of meeting the waiting egg.

It takes about 10 hours for sperm to make this journey.

Your egg only lasts around 24 hours if unfertilised.

So timing of sex for conception really matters!

The successful sperm burrows through the egg’s outer membrane in less than 30 minutes.

Fertilisation occurs, and the amazing process of conception and growing your baby is under way.

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3 Weeks Pregnant – Your Body

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

But you won’t get a positive pregnancy test 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 the pregnancy hormone HCG for a positive result a week after conception.

HCG encourages the ovaries to continue to produce progesterone.

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

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

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

It also enables your baby to feed from deposits of glycogen.

But that’s not all – progesterone is also responsible for the extra fat your body starts to store.

It helps to relax smooth muscle thus preventing premature labour.

However progesterone is also responsible for early pregnancy symptoms, such as constipation, nausea, reflux, and indigestion. Exciting times ahead!

3 Weeks Pregnant – Your Baby

What may surprise you is an egg is usually fertilised in the Fallopian tube.

The fertilised egg is swept along the Fallopian tubes and down into the uterus.

It then attaches itself to the uterine lining. This is known as implantation.

Some women experience spotting or implantation bleeding as the fertilised egg burrows in. This is sometimes an early sign of successful conception.

The egg begins to rapidly divide after it’s penetrated by the successful sperm.

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

Eventually it becomes a ball of cells called a blastocyst.

Your child’s genetic make up is decided from the moment of fertilisation, including its sex.

You might be excited to see evidence of your baby’s presence at 3 weeks pregnant.

But it’ll take some time for signs of pregnancy to show.

You’re unlikely to have have pregnancy symptoms in week 3.

Remember you don’t have to do anything different yet. Keep eating a nutritious and well balanced diet at this time. You don’t need to eat ‘for two’ – now or any time throughout pregnancy.

Keeping and maintaining your weight in a healthy range is important for the health of you and your growing baby.

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Last Updated: October 29, 2018


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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