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See related -
Pregnancy Weight Gain
Pregnancy Information

Pregnancy a Week by Week Guide

• Pregnancy week by week at week three. Fetal development now begins with the sperm meeting the egg in the fallopian tube and the miracle of life begins. Several sperm will penetrate the egg’s outer layer but only one will enter the ovum. The chromosomes of mother and father splash about and bits of both begin to form the chromosomes of your baby. The sex of the baby is determined at the moment of your conception thanks to the sex chromosomes in the father’s sperm. If you don’t like the baby’s gender then blame dad.
• Pregnancy week by week at week four. Blastocyst means “sprout pouch”, where the cells begin to divide into two groups. Those that form the placenta and those that form the baby burrow itself into the lining of the uterus which is called implantation.