There, I said it. But you've thought it, too, if you're a parent. You didn't mean it, and neither did I, but there's a moment of fear (or maybe two, or ten) when you weigh your own capabilities and the task ahead of you and realize how lacking you really are. Its impossible to be all that society says you must be for your child. Its impossible to do it all without making mistakes and fostering regrets.
Then, of course, your baby does what babies do. He sleeps peacefully that first time, or smiles, or coos or laughs. And of course you don't care that you didn't want a baby or didn't think you could handle one... he's here, he's perfect, and he's yours.