Most condom tips have a spermicide in them, I would be a bit nervous until my next period, but if you visit a planned parenthood they can give you a good option. You'll get a pack of BCPs and they'll tell you to take several at once. They might make you nauseous but after two doses, the chances of fertilization/implanatation will be greatly reduced.
Also, you may want to GENTLY suggest your man get a smaller sized condom.
