A 28-year-old woman is in the early postpartum period following an uncomplicated vaginal delivery. During her assessment, the nurse notes that the patient's uterus is firm and midline, but she reports significant discomfort rated 8/10 in intensity. Additionally, she has bright red vaginal bleeding saturating her pad in less than one hour. The vital signs are stable, with a heart rate of 95 bpm and blood pressure of 118/76 mmHg.
Considering the findings, which of the following nursing interventions is the most appropriate at this stage of her care?