Hi, I am at the end of my 36th week too and had my doc visit two days back.She confirmed that the baby was in cephalic position and will be settling final-down this week and thats why I guess I am also experiencing the same symptoms since yesterday ie crampy lower abdominal pains which at times are slightly sharp (as if diarrehea could start... uuhhh sorry for being abit disgusting!) apart of which also it seems like there is a change in the baby's movement too but after a constant check by keeping my hand on my tummy, lying on my left side for some time (to monitor the movements) and even by having orange+mango juice and lying on your left or sitting with your legs rested straight and up, the movement is justified. So i guess it is a part of the process.. as far as there are no other strange new syptoms such as bleeding, watery discharge flow, fever, sharp continueous contractions or pains and your little one is still moving every now and then... there is no need to worry as such.Good Luck and keep on monitoring your baby's movements and watch out for any new unexpected symptoms coz then you really need to call your doctor.
Take care!