Spermicide and gel

In the U.S. there are a bunch of types of birth control available over the counter without a prescription or talking to a pharmacist. Condoms, internal condoms, spermicide, the sponge, as well as emergency contraception pills and one type of birth control pill.

You could try switching brands and making sure you’re using your spermicide exactly as the instructions say you should. That said, spermicide is messy. If it bothers you, you might want to look into another method.