You should file an FIR against the said person U/s 376, 354, 420, 506, 509, 406 of IPC and some section of Information technology Act. Also if the possession of the drug was illegal then Narcotic Drugs and Psychotropic Substances Act would also apply along-with relevant supporting IPC section. It is to be made understood that whether the offence was committed on continuing basis or one time. Certain sections might not be applicable due to the fact that incident occurred 5 years ago if the punishment is less than 3 years. However, rape and assault will definitely be applicable. If the pregnancy was also terminated due to intimidation then other sections would also apply.