Alternating resting and walking, like LionsandBears said, you don't want to wear yourself out. If you're worried aobut leaking, use the maxi - pads that you've probably bought for after the little one arrives now - I found they were the only ones where I wasn't feeling constantly like I'd wet my knickers I found kneeling down and lying over the fitball quite relaxing (although didn't help prevent DD from being posterior) but spend some time on all fours too.

Good luck, hope its not too long a wait - it can be very frustrating!