Week 4 of pregnancy
What's Happening with Baby
At week 4, the incredible journey of new life is truly underway.
Following fertilization in the fallopian tube, the rapidly dividing ball of cells, makes its way to the uterus. This is a crucial step, as it establishes the connection that will nourish the baby for the months to come. Once implanted, the inner cells will begin to form the embryo, while the outer cells will start developing into the placenta, the life-support system for your baby.
Although incredibly tiny, about the size of a poppy seed, the foundational layers that will eventually form all organs and body parts are beginning to develop.
What You Might Experience
You might not feel dramatically different yet, or you might be starting to notice some very early signs of pregnancy.
The hormone human chorionic gonadotropin (hCG), which pregnancy tests detect, is beginning to be produced by the cells that will form the placenta.
This rise in hormones is responsible for many early pregnancy symptoms. Some women report a feeling of fullness or mild cramping in the abdomen. Fatigue can also start to creep in as your body dedicates energy to the monumental task of growing a baby.
Don't worry, all these changes are normal.
Key Things to Keep in Mind
If you get a positive test, it's a good idea to schedule your first prenatal appointment with your doctor or midwife.
Even before this appointment, if you aren't already, start taking a prenatal vitamin containing at least 400 micrograms (mcg) of folic acid.
Folic acid is vital in these very early stages for the healthy development of the neural tube (which becomes the brain and spinal cord).
Maintaining a healthy diet and staying hydrated are also beneficial from the very start.
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