Definately too young, we have recently just bred our dogs and you have to wait until they are at least 18nths old but it is better to wait until 2yrs old
People often say that 1 year of a dogs life is equivalent to 7 human years, so in human terms she'd only be about 3yrs 6mths at the moment!! She is no where near mature enough. As the others have said wait till she is 18mths (neary 11 human years) or 2years (14 human ones) and get advice from the vet first.
Is your pup actually pregnant at the moment and are you worried? Did she escape and get preggers. If so, take her to the vets asap. Yes, she is far too young to be having puppies, and if she has mated with a much larger dog this will be very dangerous.