I am in 32nd week of pregnancy. I have read in internet that sleeping on the left side is the best position. But I sometimes feel baby's movement on the same side. So I am worried whether it will cause any harm to my baby if I continue sleeping in the same position Or should I need to change the position from left to right.

It really doesn't matter as at 32 weeks, your baby moves around on its own to a more comfortable position in the womb. As long as you don't try to sleep on your stomach.