Yes, the sponge is just a way to hold spermicide. There are many ways to incorporate spermicide into your birth control, including a film that dissolves after a few minutes, a suppository-type insert that needs more time to dissolve, and a foam that works immediately. The foam is messy though so most women use the film as a happy medium and just mess around until it's ready to use. You could try a diaphragm or cervical cap but I think those are annoying to put in and take out.
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