pregnancy precaution in aurvedic

Are you asking how you can prevent pregnancy using a lemon? Or are you asking for alternative medicine birth control? In either case, I am unfortunately not well-versed in my knowledge of alternative medicine in terms of preventing pregnancy. Any clarification would be very helpful. I know that long ago, women used half a lemon as a diaphragm. The lemon juice would act as an acid that destroyed sperm, so that's one instance I can think of. Keep us posted.