You don't have to worry about that happening. Your corys are two different species of fish and it would be very unusual for them to cross breed. In the rare cases that it might happen, it's almost always fish that are much more similar than the ones you have.
If it turns out that you ever do want baby corys, I would suggest that you get a few more bronze corys, or some albino corys. They are very good fish to start with and if you had mature fish of both sexes, they would probably spawn for you. All of the spotted corys are much more difficult.