Your Baby’s Development at 4 Weeks
Starting at week 4, your baby is called an embryo. At just 0.2 mm, your little embryo is about the size of a poppy seed.Which Trimester? First trimesterHow Many Weeks to Go? 36 weeks
Implantation
When the fertilized egg is in the uterus and attaches to the uterine wall it is called implantation. Implantation usually takes place six to ten days after ovulation. So, if it didn’t happen at the end of week 3, your budding baby will burrow into your uterine lining this week.
Early Development
There inside your fertilized egg are all the cells that will develop into your baby and what your baby needs to survive for the next nine months. The inner cells begin to transform into your baby’s organs and body parts. The outer cells start to form the placenta.
Your Common Symptoms This Week
It’s tough to tell if you’re having early pregnancy symptoms during week 4. Many of the first signs of pregnancy are the same as the common premenstrual symptoms. However, you may notice a triphasic basal body temperature pattern or implantation spotting. Of course, some people do not have any signs this early.
PMS-Like Symptoms
Changing hormones in your body can cause symptoms similar to those you get before your period. Bloating, fatigue, mood changes, tender breasts, and even mild cramps are common signs of early pregnancy.
Triphasic Chart
If you track your basal body temperature (BBT) on a chart, you may know that a consistent rise in temperature indicates ovulation. A chart showing ovulation has two phases or levels of temperatures.Sometimes, there is a second rise or third level of consistent temperatures that begins about seven to twelve days after ovulation. A chart with three distinct temperature levels is calledtriphasic (three phases), and it’s a possible sign of pregnancy. But, it isn’t a definite sign since not all pregnancy charts show a triphasic pattern, and not all triphasic charts end in a pregnancy.
Implantation Spotting
Around the time your baby is implanting or burrowing into your uterus, you may experience a small amount of vagin*l spotting or light bleeding. While you may mistake it for a lighter-than-normal menstrual flow, it may be your first sign of pregnancy. But, don’t worry if you don’t haveimplantation spottingbecause not everyone will have or notice this symptom.
Self-Care Tips
The wait to test is almost over, but it can still be stressful. So, use this time to try to stay busy and care for yourself.
Take Care of Yourself
Eating well, getting in a little physical exercise, and taking some extra time to rest can go a long way to help you combat symptoms such as fatigue and mood changes.
Stay Busy
If you find yourself anxiously waiting to take a pregnancy test, the time could seem to slow down to a halt. Try to keep busy and find other things to focus on to make the time go faster and give your mind a break from the testing thoughts.
Advice for Partners
It’s hard for partners to wait for the pregnancy test result, too. It’s natural for youbothto be on edge. Take this time to distract yourselves together with some fun just-the-two-of-you activities.
Recommended Products
It’s almost time to take a pregnancy test. You may want to purchase one this week or early next week.
Pregnancy Tests
Your baby begins to produce hCG before it attaches to the uterus, but once implantation takes place, hCG levels in your body rise quickly. Sensitive early pregnancy tests can detect small amounts of hCG in your urine as early as 10 days after conception.
Special Considerations
When you’re excited about that possible positive result, it can be hard to wait. If you do take an early test, it might turn out exactly as you hoped. However, testing too soon could also lead to a false-negative or a false-positive result.
A Negative Pregnancy Test
By the end of week 4, the level of the pregnancy hormonehuman chorionic gonadotropin (hCG) is rising in your body. As the hCG levels go up, it can sometimes (but not always) lead toearly pregnancy symptoms. The thing is, there’s still likely not enough of the hormone present in your body to be detected by a pregnancy test yet.
Chemical Pregnancy
On the flip side, an early positive pregnancy test may indicate achemical pregnancy. A chemical pregnancy is one that ends shortly after implantation.—Allison Hill, MD, OB/GYN
A Word From Verywell
While it’s still a week of waiting, incredible events are happening during week 4. By the end of the week, implantation will be complete, and you will have a little embryo. You may even receive some early positive news.—Shara Marrero Brofman, PsyDNext week, the wait is finally over. When taken correctly, home pregnancy tests are about 99% accurate on the first day of a missed period. So, get ready for the official big news!
