Momordica charantia, aka Miss Efficient.
A Cameroon abortive pessary: 10 seeds are ground to a past and divided into three small balls using saliva. One ball is inserted into the vagina, once a day, before going to bed. It will result in high fever and putrid vaginal discharge for 2-4 days.
Yoruba decoction: Mix leaves with salt and water and store in a bottle. Wait, then remove the leaves leaving salt and water. Take one small cupful after meeting a man. The pregnancy won’t stay.