41 weeks and 2 days pregnant, why does my doctor want to see me again?

Ok so I have had no signs of labor except the loss of my mucus plug which the rest of it came out yesterday, i ended up going to the hospital to see my doctor for it because i was concerned about the color.. it was a kinda yellowish green but he said it was perfectly normal. He ended up keeping me on the machine that monitors the babys heart rate and the moms contractions? im not sure of the actual name of it.. anyways, the babys heart rate was perfectly fine but i was still not having any contractions, so he ended up sending me home, which i was fine with. Today I had my regular prenatal appointment with the same doctor, he checked to see if i was dilated but apparently nothing has changed (im not dilated), and i told him i still had no signs of contractions. he told me he wants to see me first thing tomorrow morning at the hospital so he can monitor my contractions!?? i was just on the machine yesterday, i told him i still didnt have any contractions today, why would it be any different tomorrow?? He didn't mention inducing me or anything but could that be the case?? if it is why wouldnt he tell me? im just kinda scared and it seems stupid to want to bring me there to only monitor the contractions im not even having... im not sure what to expect, any ideas?