Uhmmm. Is this nornal? need answers ASAP.

My sister is 38 weeks pregnant and she went for her last check up. She's to be induced dec 11th. Her baby doc said her babys heartbeak is going from 110-114, then going up to normal aroumd 140. What could cause her babys heart to fluctuate? They're sending her to another town to labor and delivery to monitor, but she needs a sound mind right now...