You can try bouncing on a birthing ball, sex because sperm helps dialate the cervix, and walking.
The natural Accupresure points listed in the link below in combonation with Nipple stimulation (10 - 15 minutes each side every hour. So help from a breast pump or your SO may be easier and more effective than doing it yourself) may help:
Best of luck momma. Keeping my fingers crossed that you get the vback you are hoping for.
and let me know how it goes please. This stuff has worked for a lot of people I know and I am curious to know how it goes.