Pregnancy

The vast majority of pregnancy tests are positive by the end of week 5, though some women end up having to confirm by blood test or ultrasound. If you have a scan this early, you won’t see much but a small circle (the yolk mentioned in week 4). That yolk supporting your baby is now 90 percent complete, by the way.

What does my baby look like at 5 weeks pregnant?

Well, it doesn’t look like a baby yet–that is if you could even really see it. Your baby is about 1.5 to 2.5 millimeters in length, or roughly the size of a grain of rice. During this week, the ball of dividing cells that are your baby separate into three layers: the ectoderm, mesoderm, and endoderm.

The outer layer, or ectoderm, has begun to form a neural tube, sometimes referred to as a “fetal pole.” The spinal cord, brain, hair, skin, nails, tooth enamel nerves and more come from this layer.

The middle layer, or mesoderm, forms into muscle, bone, cartilage and the heart. Amazingly, your baby’s heart should be complete, and begin to beat sometime between 5 weeks pregnant and 6. You won’t be able to hear it on a doppler for some time, but it may be visible by ultrasound as a faint flickering.

Finally, the third and inner layer forms organs such as the lungs and liver. Though, keep in mind, most of the above are only beginning to form and won’t be complete for some time.  Yes, 5 weeks pregnant is a busy time for baby.

How are things for momma at 5 weeks pregnant?

At 5 weeks, you might begin experiencing pregnancy symptoms. You may feel exhausted, and breast tenderness could become an issue (consider investing in comfortable bras). Some women also experience more cramping or even a feeling of fullness in the uterus during week five. The surge of hormones this week causes symptoms similar to those of your menstrual cycle in general. As that can commonly include headache, it’s important to note that you should avoid aspirin if you do opt for pain relief. Aspirin can be harmful to your baby. Consult your health care provider before taking any over the counter medication, including herbal or home remedies. You can read a full list of some of the earliest signs/symptoms of pregnancy here.

4 weeks pregnant is an exciting time. Why? Well, because this is the first week you may technically be pregnant and even be able to confirm that pregnancy. If you are pregnant, your baby will reach its destination in your uterus sometime this week and set up shop. This process is called implantation.

How do you know if your baby has implanted?

You may not, some women have no implantation symptoms. Some signs that implantation may have occurred include:

-About a third of women experience implantation bleeding. This is often very light bleeding (possibly as little as 1 drop or faint pink on the toilet paper when you wipe) that occurs around 6 to 12 days after intercourse or ovulation. The timing can make it tricky to tell implantation bleeding from a period or pre-period spotting.

-Occasionally women report cramping or a “pinching” feeling in their uterus around implantation.

-Those who are charting their basal body temperature may also notice a sudden drop followed by a rise in temperature at implantation.

Pregnancy Symptoms at 4 weeks:

Keep in mind that symptoms of pregnancy don’t begin immediately after implantation. Pregnancy symptoms are caused by hormones associated with pregnancy which only begin to rise after implantation. Some women do report pregnancy symptoms very early, but this is because progesterone is present before implantation, and progesterone is to blame for many early pregnancy signs. You can take a quiz or read more about early pregnancy signs here.

Ok, lets assume your baby implanted, congratulations! What happens next?

Your body immediately begins to produce the hormone hCG after your baby implants. This hormone tells the corpus luteum to keep making progesterone, so you don’t get your period. It’s also what will cause a pregnancy test to become positive in the coming days. The blastocyst (remember that’s what the fertilized egg is called once it implants) begins to split creating your baby from some cells and chorionic villi, or hair like projections that will later form your placenta. These projections help anchor your baby to your uterus. Fluid also begins to build, and a yolk-like sac begins to form. This yolk will nourish your baby until the placenta is complete. At the moment, this whole collection of cells is somewhere between the size of a pinhead and a poppy seed, but the speed at which your baby is going to grow from here on out is impressive.

Can you confirm your pregnancy at 4 weeks pregnant?

By the end of week four, hormone levels are most likely high enough to receive a definitive yes or no on an early result home pregnancy test, though waiting until week 5 can be a more sure-thing. Remember, that hCG levels at least double every 48 hours in a normal pregnancy, so waiting even one day later can make a huge difference between no line, a barely visible line, and an unquestionable yes. Be patient.