Awoman arrives at the clinic seeking confirmation that she is pregnant. the following information is obtained: she is 24 years old with a body mass index (bmi) of 17.5. she admits to having used cocaine "several times" during the past year and drinks alcohol occasionally. her blood pressure (bp) is 108/70 mm hg, her pulse rate is 72 beats/min, and her respiratory rate is 16 breaths/min. the family history is positive for diabetes mellitus and cancer. her sister recently gave birth to an infant with a neural tube defect (ntd). which characteristics place the woman in a high risk category?