Updated 08 October 2018

Week 3: 37 weeks to go!

Counting from the first day of your last period, you have 37 weeks to go. Let's check in on your and baby.

Welcome to the very start of your pregnancy journey.

Your baby's progress:  

  • Congratulations! One lucky sperm has beaten millions of his competitors to be united with the ovum (egg).
  • A fertilised ovum is called a zygote. The zygote floats down the Fallopian tube and divides into two identical cells.
  • The cells continue to divide at a rapid rate.
  • By the sixth day, a cluster of more than 100 cells has been produced.
  • The chromosomes of mother and father form the chromosomes of the baby.
  • Your baby's gender is determined by the sex chromosomes in the father's sperm.
  • By the end of the first week the cells have formed a blastocyst – a hollow, fluid-filled cluster of cells. The next two weeks are known as the germinal period.

Good to know: 

  • When two ova (eggs) mature and are fertilised during a single ovulatory cycle, dizygotic (fraternal) twins are formed. The majority of twins occur in this way. Twins developing from the division of a single fertilised egg are known as monozygotic (identical) twins.


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