Re: ways to start labor or encourage it!
Maybe not what you want to hear but I'd just stick it out. Ultrasound estimates on weight can be VERY innaccurate. Your baby will come when he/she is ready
In the mean time, swimming can be a nice thing to do to take the weight off for an hour or so. I also found yoga or other relaxation techniques helpful in my last 3 weeks.
ISO: M/L or L Zany Zebra, Pot Bellied Pig Designs, & girly shorties or skirties.