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second trimester
The heart begins to beat at the end of 3 weeks. Our 'reptilian brain' develops within the first two months, but our conscious thought does not develop until six months into the pregnancy.
first
trimester
After a sperm fertilizes an egg its referred to as a zygote. Then it becomes a fetus, I believe after the first trimester.
In the first three weeks, the embryo has formed the forebrain, the midbrain and the hindbrain. In your second trimester, the major structures of the brain are in place and functioning. From this point the brain and organs continue to develop.
Pregnancy is broken down into three trimesters. The baby develops most rapidly during the first trimester (weeks 1-13). The baby starts off as a collection of cells that develop into an embryo. At 8 weeks, the embryo is called a fetus because the baby resembles a human. At this time, all major organs and systems have been formed. During the second trimester (weeks 14-26), the organs and systems start to mature. During the third trimester (week 27-40), the baby starts to pack on the pounds.
always
The same way that a human embryo or any other mammalian embryo does.
none what so ever :D
If there was an actual embryo, it was not a false pregnancy.
The embryo develops in the uterus of the mother.