Stretching your cervix?? :/

I will be 39 weeks on Tuesday! Due date is March 1st. I've been telling myself I want to wait for the baby to arrive on his own time but now I'm just getting uncomfortable and it's getting kind of painful. At my doc appointment this past Tuesday, they told me I was dilated at a 1 and if I wanted to the next appointment they could "stretch my cervix" and half the time it starts labor within 24 hours. Is this something anyone else has done? If so, what's it like/does it hurt and did you go into labor within 24 hrs like they said? They said it's not guaranteed and some people have to end up waiting another week anyway.