Hi,
The failure rate of spermicidal foam is around 15 to 29 % .
( Source - http://www.managingcontraception.com/choices/ch-foam.html)
Also another options to consider are Today sponge .Today® Sponge is 89% to 91% effective .The contraceptive sponge combines barrier and spermicidal methods to prevent conception .
(Details- http://www.todaysponge.com/What-Is-Today-Sponge/index.html)
Also a gynaecologist can be consulted for discussion on IUD .An intrauterine device, called an IUD for short, is a small, plastic, T-shaped device with a string attached to the end. The IUD is placed inside the uterus to prevent pregnancy.
(Details - http://familydoctor.org/online/famdocen/home/women/contraceptive/319.html )
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