Early Pregnancy Day By Day

At week 1, some women show no signs of pregnancy, while others may have mild cramps, exhaustion, and breast tenderness.

Usually, the first day of a woman’s last menstrual cycle is used by medical practitioners to determine the first week of pregnancy. The first week after the last menstrual period can be used to estimate a woman’s due date for pregnancy even when she is not yet pregnant.

The first week of pregnancy shall be referred to in this article as beginning one week after conception, or the actual first week of pregnancy.

A missed menstruation is frequently the first sign of an early pregnancy.

Can you feel symptoms 1 week after conception? 

Young woman looking in the mirror during 1eek 1 of pregnancy
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Conception, or fertilization, occurs when the ovary releases an egg (ovulation), and a sperm fertilizes it. This can happen about 14 days after the menstrual cycle starts, according to March of Dimes.

According to Planned Parenthood, implantation begins about 6–7 days after conception. This is when the fertilized egg attaches to the lining of the uterus. This movement of the egg may break down blood vessels within the uterus wall, which may cause light bleeding and cramping.


Implantation bleeding is an early sign of pregnancy. It is not like a menstrual period. Instead, it is light bleeding that may involve a single spot of blood or a small amount of pink discharge. The spotting may last for a few hours, or it may last for a few days.


Women may also feel mild cramping as the embryo attaches to the uterus wall. Women may feel these cramps in the abdomen, pelvis, or low back area.

The cramping may feel like a pulling, tingling, or pricking sensation. Some women experience only a few minor cramps, while others may feel occasional discomfort that comes and goes over a few days.


Pregnancy symptoms in week 1 

Pregnancy symptoms in week 1 are different for every woman and every pregnancy. According to the Office on Women’s HealthTrusted Source, the most common first sign of pregnancy is a missed menstrual period.

Other early pregnancy symptoms include:

Not all of these symptoms are unique to pregnancy. It is also important to note that early pregnancy does not always cause noticeable symptoms.

The best way for a person to find out if they are pregnant is to take a pregnancy test.

Is 1 week pregnant too early?

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During weeks one, two, or three, you may not even suspect you’re pregnant and you might not notice any pregnancy symptoms at all, as it’s still very early. This is completely normal. Remember you might not have even conceived until 3 weeks pregnant.

When to take a pregnancy test 

A pregnancy test measures the amount of Human Chorionic Gonadotropin (hCG) hormone in the urine. This hormone is only present when a woman is pregnant. As the egg grows into an embryo, the cells that surround it and later become the placenta produce hCG.

Planned Parenthood indicate that it is best to take a pregnancy test as soon after a missed period as possible. A pregnancy test may return a positive result as early as 10 days after a person has had sex without contraception. However, it typically takes about 3 weeks before there’s enough hCG in the urine to produce a positive pregnancy test.

There are many affordable and reliable pregnancy tests available over-the-counter (OTC) or online. A home pregnancy test can tell whether you are pregnant in a few minutes, with most claiming to offer almost 99% accuracyTrusted Source.

To help ensure an accurate result, the best time to take a pregnancy test is 1 weekTrusted Source after a missed period. Results of a pregnancy test are either positive or negative.

If a woman takes the pregnancy test earlier than 1 week after a missed period, it may give a negative result, even if the person is actually pregnant.

If a person believes they are pregnant despite a negative test result, they should repeat the test after 1 week.

To avoid a false negative result, check the pregnancy test’s expiration date, and carefully follow the written directions.

A person can also have a blood test to determine whether they are pregnant. This test identifies the presence of hCG in the blood. The blood test can show a positive result a few days earlier than the urine test can, but it may take up to 48 hrs to get the results back from the lab.

When do you start to feel pregnant?

Symptoms, such as breast tenderness and morning sickness, tend to develop abruptly. Typically this happens about two weeks from when you missed your last period (six weeks since you actually had a period)

Very early signs of pregnancy 1 week

  • At this stage of your journey, you’re not actually pregnant yet. In fact, you probably have your period; the symptoms you’re experiencing are a result of PMS, not pregnancy.
  • Now is the time to start prepping for pregnancy: Track your days to chart your cycle, begin taking a prenatal vitamin and make lifestyle changes to get ready for the long road ahead.
  • Just got a positive pregnancy test? You’ll want to skip ahead. If you’ve tested around the time of a missed period, you’re probably actually about four weeks along (congrats!).

In doctor speak, one week pregnant means you’re on your period and not yet pregnant. You won’t actually conceive your baby until week two or three, depending on the length of your cycle.

Baby at Week 1

If you’ve just found out you’re expecting, you might think this is your first week of pregnancy, but you’re probably around 4 weeks pregnant. Yes, already! (Your OB will give you a more accurate estimate when you go in for your first prenatal appointment.) Skip ahead and check out week 4.

How big is baby at 1 week?

Baby is but a glimmer in your eye. Remember you’re not actually pregnant yet—and if you are, you’re more likely about four or five weeks along.

1 week ultrasound

You’re not likely to have a 1 week pregnant ultrasound. But if you’ve been trying for a while to get pregnant and have seen a fertility specialist, you may have had an ultrasound to check for fibroids, to see how many follicles (which grow into eggs) are in your ovaries and/or to gauge the thickness of your uterine lining. If there are any problems, your doctor may prescribe a fertility treatment that can help you conceive. Now, get ready to have some sex. You’ve got a baby to make!

Pregnancy Symptoms at Week 1

At one week pregnant—remember, at this early stage, the symptoms you’re experiencing are those typical to your period because you’re not actually pregnant. These symptoms may last from three to seven days and can include:

Vaginal bleeding

Your body is shedding the uterine lining, which was plumped up just in case of a pregnancy.

Lower back pain and cramps

To release that lining, your uterus contracts, causing your back and abdomen to ache.


Fluctuating hormones can give you a bloated belly right before and during your period.

Mood swings

Those hormone surges can also cause irritability and wreak havoc on your emotions


Many women complain of menstrual migraines, which are also hormone-related. (Surprise, surprise.) Ice packs, OTC pain relievers and relaxation exercises may help ease the pain.


Pregnancy symptoms are different for every woman. Some women may notice symptoms, such as spotting or a headache, during week 1 of pregnancy. Others may only experience a missed period. Some women will have no symptoms at all.

Whether a person has symptoms or not, the best way to determine if they are pregnant is to take a pregnancy test.

A range of pregnancy tests is available for purchase online.

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