I dont know of any ancient method to prevent pregnancy naturally other than rudimentary condoms (goat's intestines or so). About herbs I only know of how to cause very early abortions like before it forms a human body or so. I havent been able to experiment on that subject tho so as people have said, get a good job, use female condoms and the job will help in case you will have to buy diapers.
updated by @rafael-rodriguez: 07/24/15 12:49:48AM