Why not do an IUD, if you can't get on the pill? It's available at Planned Parenthood, as is the pill of course.
Spermicidal condoms is fine, the spermicide helps with the 80% success rate posted for condoms, make it better than 80% (I just don't know how much better).
If used properly the condoms will protect you from getting pregnant, and the odds extremely slim for you to get pregnant.