Finally, after two weeks, you have your baby inside you by the 3rd week of pregnancy. In the previous week, your egg had fused with the sperm. This is the week when the fertilization and implantation happens.

What is Happening in the 3rd Week of Pregnancy?

Timing plays a major role in deciding your pregnancy. Even by the third week, you may not see major changes on the outside. But inside your belly, your baby has probably started building its home.


After the egg meets with sperm, they fertilize into a small group of cells called the zygote. This zygote is your baby. Only one sperm out of the whole bunch fertilizes the egg. As fertilization happens, the next step for the zygote is to multiply into cells. From here, it will move down to your fallopian tube and into your uterus. The zygote attaches itself to the uterus lining, while your body prepares to host itself for the baby.


By the 3rd week of pregnancy, your baby is present but is way too tiny. You can say that it is the size of a grain of salt or the head of a pin. Because of its incredibly small size, you may not feel any change in the shape or size of your belly. The cell multiplies and grows rapidly at this point. One part of this division becomes the placenta. The placenta further produces hCG (human chorionic gonadotropin), which is the pregnancy hormone.

Fetal development starts by this week – the formation of the baby’s brain, spinal cord, heart and the gastrointestinal tract will initiate.

Pregnancy Symptoms Week 3

It is possible that even by the 3rd week of pregnancy, you may not know whether you are pregnant or not. It is because determining the timing of conception is very difficult. You are expected to experience these 3rd week pregnancy symptoms:

  • Implantation bleeding (Only spotting)
  • Nausea
  • Sore nipples
  • A heightened sense of smell
  • Lower abdominal pressure
  • Nipples will darken
  • Missed period

If every process has happened timely, your home pregnancy test will be positive by this week. You can also take a blood pregnancy test to confirm your gestation.

Pregnancy symptoms week 3 may not be very high because it is only the beginning, but they will be there.

Tips for 3rd Week of Pregnancy

Your body is ready to host the baby. This means that you should not only watch out for the pregnancy symptoms week 3 but also help yourself for this beautiful journey. Practice the following for a healthy pregnancy:

  • Increase the intake of iron and vitamin C
  • Eat Calcium-rich foods
  • Don’t colour your hair in the first trimester
  • Drink plenty of water
  • Make sure to eat loads of protein
  • Calculate due date
  • Take Prenatal vitamins
  • Get ready for the first trimester

Read this Next: 4thWeek of Pregnancy: Baby is the size of a Poppy Seed

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