First Trimester

Every week of your pregnancy brings new developments for both you and your baby. The first trimester of pregnancy is a particularly exciting time!

First trimester of pregnancy

The first trimester of pregnancy begins at week 0 and goes until week 13 (approximately 3 months). Each week both you and your baby will be making changes.

First Trimester Pregnancy

Congratulations if you have just discovered that you are pregnant! At Birth Literacy, you can find out all you need to know about your pregnancy…from conception to labor and delivery and more.

The first trimester is a very important time for your developing baby. It is when your baby changes from a fertilized cell to a fully formed baby. All of the organs and body parts develop in the first 13 weeks.

While you may not look pregnant, you will feel all of the pregnancy symptoms full force. The flood of hormones racing through your body is preparing to grow and house a baby for the next 9 months! So while you may not be thrilled by some of these symptoms, know that these temporary aches and pains are necessary to make your baby develop and grow properly.

How You Will Change

Unless you’ve been pregnant before, you probably won’t notice your expanding belly until the end of the first trimester. But you will sure feel the effects of being pregnant. Morning sickness, tender breasts and mood swings just to name a few. The hormones racing through your body are causing these discomforts but are extremely important.

Remember that every woman in different. And just because your mom or sister felt or looked a certain way, doesn’t mean that you will.

Weight gain during the first trimester has a lot to do with how you feel. For instance, women who experience a lot of morning sickness often experience loss of appetite and may lose a couple of pounds. It’s ok as long your weight picks up during the second and third trimesters. A good rule of thumb: if your doctor or healthcare provider isn’t concerned, you shouldn’t be either.

However, if you are overly hungry, try to keep track of your caloric intake. Just because you’re eating for two, doesn’t mean you need double the calories. Try to keep as balanced and healthy of a diet as you can.

First Trimester Weeks

Here is a breakdown of your first 13 weeks, or first trimester, of pregnancy:

  • 1 Week Pregnant – What is considered your first week of pregnancy is actually your menstrual period.
  • 2 Weeks Pregnant – During week 2 of your pregnancy, your egg will be fertilized by your partner’s sperm.
  • 3 Weeks Pregnant – In the 3rd week of pregnancy you have conceived and your body has started on the miraculous path of making a baby.
  • 4 Weeks Pregnant – During your 4th week of pregnancy, your baby becomes an embryo and is approximately the size of a poppy seed.
  • 5 Weeks Pregnant – At 5 weeks of pregnancy, a shape is beginning to form, a heartbeat can be detected and your baby is the size of a sesame seed.
  • 6 Weeks Pregnant – At 6 weeks of pregnancy, your baby’s ears, eyes, nose and mouth are beginning to form. Your baby is the size of a lentil, about a quarter of an inch long.
  • 7 Weeks Pregnant – At 7 weeks pregnant, your baby still technically an embryo but is already the size of a blueberry.
  • 8 Weeks Pregnant – You can’t feel it yet, but at week 8 of your pregnancy your baby is constantly moving and is already the size of a kidney bean.
  • 9 Weeks Pregnant – During your 9th week of pregnancy, the heart is almost completely developed and your baby is about the size of a grape!
  • 10 Weeks Pregnant – In week 10 of pregnancy, your little one has completed the most critical part of development and is now the size of a kumquat.
  • 11 Weeks Pregnant – At 11 weeks of pregnancy, your almost fully formed baby is the size of a fig and will soon begin opening and closing it’s fists.
  • 12 Weeks Pregnant – At 12 weeks of pregnancy, your baby is the size of a lime and is looking more and more like a fully formed baby.
  • 13 Weeks Pregnant – Congratulations! This is the last week of your first trimester and your baby is about the size of a pea pod.

Now, find out all you need to know about your second trimester of pregnancy!