Can I get excited yet?
Your physical changes this week
You could start to feel some nausea, or morning sickness, especially if you haven t eaten for a while. The smell or thought of some foods may turn you off, even if you usually love them. Coffee, fish, red meat and even pet food can be enough to make you feel you want to vomit.
Your breasts may be tender and your nipples more sensitive. Your breasts may even look fuller and more rounded, especially if your breasts are usually a small size.
You may want to go to the toilet to pee more often. You donâ€™t seem to be able to hold on for as long as you usually do and only can pee small amounts. This is because of the increase in your blood volume and the pressure of your full uterus pressing down on your bladder underneath.
You may have some slight spotting from an implantation bleed.
Your emotional changes this week
You may feel like you usually do before you have a period. A little more emotional, easily irritated and generally feeling more moody.
If you want to conceive, but have a negative pregnancy test, you may be feeling disappointed with the result. Talk with your partner or a supportive friend. Alternately, if you didnâ€™t plan on getting pregnant, but find out that you are, this can be a stressful time.
Your baby's changes this week
In the 4th week of pregnancy there is a lot of organization and cell separation going on. Three distinct layers of cells start to form. The ectoderm (outer layer), will eventually become the baby's skin, eyes, hair, their nervous system, their brain, and even the enamel of their teeth. The middle layer (mesoderm) will become their skeleton, muscles and kidneys, tissues and vascular (blood) system. The layer on the inside (endoderm) will eventually become their internal organs.
Once a cell has a specific function, it canâ€™t become a different type of cell. Every cell is pre-programmed from the start and knows what to do and what it will become.
Hints for the week
Make the first prenatal appointment with your pregnancy care provider for ongoing prenatal care.
Avoid getting overheated and try to stay healthy. An elevated temperature in the early weeks of pregnancy can sometimes carry a risk to the baby as it is forming.
Now we move onto week 5, when your baby is growing and getting comfortable.
For more information see Pregnancy or Week by Week.
The information of this article has been reviewed by nursing experts of the Association of Women’s Health, Obstetric, & Neonatal Nurses (AWHONN). The content should not substitute medical advice from your personal healthcare provider. Please consult your healthcare provider for recommendations/diagnosis or treatment. For more advice from AWHONN nurses, visit Healthy Mom&Baby at health4mom.org.