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Week 1
Today is the first day of the last menstrual period. -
Period: to
First Trimester
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Week 2
The uterus begins forming a lining called the endometrium that will thicken over time as eggs mature and form each week prior to ovulation. -
Week 3
Ovulation occurs and the egg in the uterus becomes fertilized. -
Week 4
The sex of the baby is determined by the number of chromosomes after the division of the egg. -
Week 5
The placenta, also referred to throughout pregnancy as the baby's "life support" is developed. -
Week 6
The lobes in the baby's brain begin to develop by dividing into five parts. -
Week 7
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Week 8
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Week 9
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Week 10
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Week 11
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Week 12
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Week 13
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Week 14
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Period: to
Second Trimester
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Week 15
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Week 16
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Week 17
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Week 18
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Week 19
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Week 20
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Week 21
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Week 22
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Week 24
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Week 25
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Week 26
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Week 27
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Period: to
Third Trimester
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Week 28
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Week 29
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Week 30
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Week 31
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Week 32
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Week 33
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Week 34
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Week 35
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Week 36
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Week 37
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Week 38
The baby weighs around seven and a half pounds. -
Week 39
While in its final birthing position, the baby will continue to kick under pelvis that can cause discomfort to the abdomen. -
Week 40
Contractions begin to indicate the arrival of the due date.