Carol Brown, a 27-year-old teacher, is in her 10 th week of pregnancy and has had mild nausea and vomiting for the past month. She presents for her second prenatal visit and asks for something to treat her morning sickness. The nurse midwife places her on vitamin $\mathrm{B}_6 25 \mathrm{mg}$ three times a day plus doxylamine $12.5 \mathrm{mg}$ three times a day. Ms. Brown asks if these medications are safe for her baby. She also asks if she should wait a few weeks to see if the symptoms go away on their own.
- How should the nurse respond?