If a miscarriage occurs after this point, it may be possible to tell if it is male or female. All embryos begin life looking very much the same, as far as outward appearances are concerned. Whether the embryo develops into a male or female is determined by the genetic information contained in the embryo. Some women notice changes in their hair, fingernails or toenails during pregnancy. This doesn't happen to everyone, but if it happens to you, don't worry about it.
Some fortunate women notice an increase in hair and nail growth during pregnancy.
Others find they lose some hair during this time. Some doctors believe these changes occur during pregnancy because of increased circulation throughout your body. Others credit the hormonal changes occurring in you. Still others explain these differences with a change in phase of the growth cycle of the hair or nails. In any event, these differences are rarely permanent.