No, you should be fine. All my toads mate all the time for the last couple years, but no eggs yet (and I have eight of the silly things). From what I've heard, it's a complicated process to mate toads, which includes a cooling period to simulate winter among other things. Of course I'm no expert, but you can check the caresheets around. I've never gotten into breeding them, but it looks like breeding them takes special conditions. I wouldn't worry.