a client has been in labor for 10 hours and is 6 cm dilated. she has already expressed a desire to use nonpharmacologic pain management techniques. for the past hour, she has been lying in bed with her doula rubbing her back. now, she has begun to moan loudly, grit her teeth, and bear down with each contraction. she rates her pain as 8 out of 10 with each contraction. what should the nurse do first?