My humble advice

don't in anyway try to dump the dead body by the road side or Bury her, cos it might back fire later in life, it might not be now, but later in life, just take a bold step go to her family and report yourself, but first of all go the station ( police station) with your lawyer and report your self, before goin the her parent.
Above all meet with your pastor and pray about it for divine intervention for GOD.

WITH THE ABOVE ADVICE, GOD WILL DEFINITELY SHOW YOU MERCY COS HE'S A MERCIFUL GOD

AM following you for the next episode