Chemical contraceptives work by killing sperm and are non-prescription. Proper use of spermicides requires reapplication for each act of intercourse, and they are most effective when used in conjunction with a barrier form of contraceptive. In addition, we have information on proper use and effectiveness of spermicidal foam and jelly. All Hormonal methods of contraception prevent pregnancy by altering the levels of estrogen and progesterone in the body. Click on the Calculate Button.
Abstinence is effective only in the present.
The choice must be continuously made to practice abstinence, or another form of contraception should be practiced.