Other options for preventing pregnancy?

I'm going to visit my long distance boyfriend this Monday and I'll be staying with him for two weeks. We use condoms every time we have sex HOWEVER I'm not on birth control. I've looked into going on birth control however the earliest I could of gotten on birth control was 3 weeks ago. The reason I didn't go on it was because his prom is on Tuesday and I know for 1-2 months after going on the pill you break out like crazy. We both don't feel safe just using condoms to prevent pregnancy and I know there are spermicide sponges and other methods to prevent pregnancy that isn't birth control. Do you ladies have any ideas on what else I can use and where to get it? Shoppers drug mart is pretty much the only drugstore accessible where he lives and I'm not sure if they sell other methods of birth control there. Thanks!
* if there was any confusion were still going to use condoms but I wanted something else to use with the condoms as well to double up!:)