A nurse is caring for a primigravid client at 40 weeks gestation in active labor. Assessments include: cervix 5 cm dilated; 90% effaced; station 0; cephalic presentation, FHR baseline is 135 bpm and decreases to 125 bpm shortly after onset of 5 uterine contractions and returns to baseline before the uterine contraction ends. Based on this assessment what action should the nurse take first?
a) Administer oxygen to the mother
b) Notify the physician of fetal distress
c) Change the mother's position
d) Document the findings as normal