Nicotine can cause your infant to be born with a smaller birth rate than is usual. This may in turn have it's own ramifications. During pregnancy , the infant is aware of the mother's emotional and psychological state, and the mother should be in a serene state, happy at the prospect of creating life. She should eat healthy foods in quantities sufficient to provide nourishment for herself and the infant. She should drink the correct fluids in a correct amount.
Rest is important.
Listen to your body. When your body tells you to take a nap, or go to bed for the night, or just to sit down and rest, those messages are to be heeded. Put aside worry, decrease the stress in your life, and above all, enjoy this time. Regular visits to your health care provider are essential. It is often a good practice to consult your provider even before you become pregnant.