They would be advised to use barrier methods (Eg condoms with spermicidal creams) instead.
Using over the counter spermicidal gels or foams along with condoms is a better way to increase their effectiveness.
Spermicidal creams or gels are unnecessary during pregnancy and they are made of chemicals that are effective in killing sperm, but they can also cause irritation in the vaginal region.
The Today Sponge is a non-hormonal spermicidal barrier method of birth control used by females to prevent pregnancy.
Copper IUDs contain no hormones because the metal has natural spermicidal properties.