I am a 32 year old mother of three entering med. school in August, 2000. Our children are 4,5, and 8. Surprise! We just found out that we are now expecting our fourth child. My husband is extremely supportive and works out of our home so that he can offer more support to the children. I am concerned about possible harmful chemicals in anatomy lab, as well as the logistics of a Valentine's baby in the midst of my first year. Any advice?