AHHHH Monkey! Doctor gave bad advice!! DO NOT USE SPERMICIDE!

Here's why: The world health organization has condemned it because they have found that nonoxynol-9 (main ingredient in spermicide) irritates the lining of the vagina, leading to subsequent infections, and a higher rate or STIs. All ethical condom companies (I say all, but there is only one I know of that has done this- Mayer Labs) have destroyed their stock of spermicidal condoms. Here's the link to the WHO press release...WHO Spermicide Press Release

Spermicide only has an effectiveness rate of around 15%, so IT IS NOT WORTH IT. Your sexual health is much more important.