why not wait?
well, because when you get to 40 + weeks, you are most likely desperate to have the baby...and a sweep might just help ..! and if you are really over, a sweep might help push you into a natural rather than induced labour
i;ve had two - neither worked!! well, one was 3 days before i was being induced, and the other was at 39 weeks, as i cried so much at the appointment !! . DD born 1 week later, on her due date !
cons- they can break your waters (rare, but happens), which can mean a whole host of new protocols coming in to play, they can be uncomfortable, they don;t always work!
pros- might stop you having to have a full medical induction, and it makes you feel like you are doing something to help,
pro / con - midwife has to give you an internal first, before actually knowing if she can sweep you and can tell you about the state of your cervix, whether dilated, soft etc. or not...which can be a pro or a con , depending !