Do you know of any experienced breeders in your area? If it continues to lose weight, you may have to do an assist feed with a very small food item. Small mouse or rat crawler. Something a little smaller than the snakes is wide.

Sometimes this is required with BPs that are still very young and too much weight loss could eventually be dangerous. It can trigger their feeding response but I don't recommend doing it alone without someone with experience helping you the first time. You don't want to injure the snake.