If you breed your bitch at such a young age none of her puppies will survive and it will make her seriously ill as well.

Do you have a plan as to what you will do with all the puppies if you breed her when she's older? You will have to keep them for at least 8 weeks before finding them new homes, pay for their vaccinations and dewormers, pay for the mother's vet checks etc. Even if you plan to sell them you will spend more on them then you will get selling them.

And you'll have at least 8 weeks of a wrecked house with chewed furniture and puppy poo everywhere....