It won't hurt your baby. What they are going to do is very quick and simple. They take their finger and move it around in a circle inside your cervix. You feel a little bit of a pinch feeling but its not painful. What it does is have your body release oxytocin which is a hormone. Also it helps the amniotic sac separate a bit from the wall. Baby will be fine and so will you. It literally takes like 20 to 30 seconds.