the nurse is receiving shift report on four clients on an antenatal unit. the four clients are: (1) a 35-week-gestation mother with severe preeclampsia started on a maintenance dose of magnesium sulfate 1 hour ago; (2) a 30-week-gestation client with preterm labor on an oral tocolytic and having no contractions in 6 hours; (3) a hyperemesis client with emesis 4 times in the past 12 hours; and (4) a 33-week-gestation client with placenta previa who began to feel pelvic pressure during change of shift report. which action should the nurse take first?