Was the spermicide on the condom (like a condom with spermicidal lube), or was it separate and placed at your cervix? If the first, the spermicide will do virtually nothing. But actual spermicide that is inserted at your cervix tends to be something like 75% effective. I'm not sure if that applies to use by itself or use with a sponge/ cervical cap/ etc.
If you really don't want to get pregnant, you should take an emergency contraceptive pill. You can get it from a drugstore for around $40 and from clinics like Planned Parenthood, I believe for a smaller price and sometimes for free.