I just wanted to say that walking worked for me.

I did serious couple of km walking though.
With my girls I went 8 & 7 days over. Had a stretch & sweep at 40+2, but nothing for a few days.
Had a bit of pre labour, then walked about 5 kms. She was born at 7am the next morning.
DS came 2 days early & I put it down to my 2 km walk the night before.

Everyone is different though. What works for some might not for others.