21 Days After Fertilization
A pregnancy test taken 2 weeks after conception can measure hCG, the pregnancy hormone in the mother’s urine, indicating that she may be pregnant. A physical exam or ultrasound is necessary to confirm the results.
3 Weeks Gestational Age
The embryo begins to implant in the lining of the uterus. Once this occurs, hormones trigger the mother’s body to nurture the pregnancy and prevent her monthly periods. The baby is about the size of the “period” at the end of this sentence.
4 Weeks from First Day of Last Period
By now the baby is completely attached to the lining of the uterus and draws nourishment from its mother.
5 weeks Gestational Age (from first day of last period)
The heart, about the size of a poppy seed, is the first organ to function. The first signs of brain development are evident, and the foundation for every organ system is already established and beginning to develop.
3 Weeks Gestational Age
The embryo begins to implant in the lining of the uterus. Once this occurs, hormones trigger the mother’s body to nurture the pregnancy and prevent her monthly periods. The baby is about the size of the “period” at the end of this sentence.
4 Weeks from First Day of Last Period
By now the baby is completely attached to the lining of the uterus and draws nourishment from its mother.
5 weeks Gestational Age (from first day of last period)
The heart, about the size of a poppy seed, is the first organ to function. The first signs of brain development are evident, and the foundation for every organ system is already established and beginning to develop.
