I've heard that you triple the weight at 8 weeks and double the weight at 12 weeks to give you an estimate of the puppies adult weight. That means your puppy will maybe be around 8lbs. or so? Although, one of my puppies I sold weighed over 3 lbs. at 12 weeks and today only weighs 4 1/2 lbs. so it is just a guess. Glad to hear you will love your puppy no matter what it weighs, that's the most important thing
good luck with your new puppy