I have a male cockatiel and a female cockatiel, and up until this morning I thought they hated each other, but I'm quite certain they were mating. So basically, I'm wondering what the chances are that she could be pregnant, they could have been mating at other times for all I know. And if she is, how long before she lays the eggs and what the heck do I do!? Thanks!

THIS site has alot of information about Cockatiels. Scroll down and there are two links to pages specifically about breeding.

When I had cockatiels (before I had a computer), I found a very helpful paperback book at PetSmart also.

Good luck!