At week 4 of your pregnancy, implantation is still taking place. You will begin to produce higher levels of the hormones estrogen and progesterone, which will cause many of the changes in your body throughout the rest of the pregnancy.
At about 6 to 12 days after fertilization, your HCG levels will be high enough to be detected in a home pregnancy test. If the test is positive, schedule an appointment with your health care provider to confirm the results. You may also experience the typical signs of pregnancy, including fatigue, frequent urination, breast pain and morning sickness.
What Is Happening To Your Baby
The cells in the embedded blastocyst begin to differentiate, or specialize, into distinct layers which later undergo further differentiation. One such layer undergoes a process known as gastrulation in which it further differentiates into three layers that will form the baby’s organs and tissues (the ectoderm, endoderm, and mesoderm). At this point, your baby is roughly the size of a poppy seed.
In the late stages of week 4 or early stages of week 5, tiny arms and legs, called buds, begin to develop, although they are not yet visible.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.