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4 Weeks Pregnant: Week by Week Pregnancy

Symptoms, Tips and Fetal Development


The baby you're carrying begins to develop specialized organs by the time you're four weeks pregnant and your own body responds with increased hormone levels.

Your Baby at Four Weeks

When you are pregnant at four weeks, your embryo is developing three different levels of cells to correspond to the exterior skin, nails, and hair as well as the specialized, internal organs such as the heart, stomach, and kidneys. This begins when the ball of developing cells splits into two distinct elements—the baby itself and the placenta that will grow around the baby and nourish it for the remainder of the pregnancy.

Your Body at Four Weeks

Most doctors calculate the weeks of your pregnancy by counting from the onset of your last period, so being four weeks pregnant isn't actually accurate in all cases. Some women may be only two weeks along, but will be considered pregnant at four weeks. Many expectant moms can tell they've reached the four-week mark because their body begins to go a bit haywire, with a steep increase in hormones such as progesterone and estrogen. This can result in bloating, mild cramping, and mood swings. Relaxation is vital to keeping those mood swings at bay; try these tips for using your own breathing to calm yourself.

human embryo at 4 weeks

A slow digestive system is one of the symptoms at four weeks pregnant that surprise many women, but it shouldn't be a cause for alarm. In fact, your body is slowing down digestion so that it has more time to absorb vital nutrients that will pass through the placenta and into your baby.

What to Consider When You're Four Weeks Pregnant

Keep in mind that your hormones have dramatically increased by the time you are pregnant at four weeks; the weepiness, easily hurt feelings and headaches you may be experiencing are normal and won't last forever. In the coming weeks, your body will adapt to the new hormone levels and you will get your emotional equilibrium back. The support of your spouse and family will go a long way toward making the next few weeks of pregnancy more comfortable. Our article on creating a peaceful pregnancy can also help.

What To Expect at 5 Weeks Pregnant


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