Think about how many BPs are out in the wild. Any of the females could lay 18 fertile eggs and we'd never know. I think it's possible. I think it would be more likely to happen in the wild where we can't see rather than in captivity. Just based on the sheer number of wild BPs.

Humans have had 4, 5, 6, or more babies in one pregnancy. No one thought that was possible until it happened.