Explain to your friend normal prenatal development during the germinal and embryonic periods.

For this question imagine you are a nurse and are speaking to someone without a medical background (ie avoid being overly technical with the information presented):A friend comes to you very upset because she did not realize she was pregnant until the end of the first trimester. She is concerned that she could have done something to jeopardize the embryo during the time she did not know about the pregnancy. Explain to your friend normal prenatal development during the germinal and embryonic periods. Be sure to include specific information regarding the critical and sensitive periods of time during the first 12 weeks and discuss some of the more common teratogens and the potential effects on the developing embryo.