Hi mama, Rest assured, your body is built especially for the baby you are having :) To share, I’ve seen petite mamas birthing babies more than 4kg. My son weighed 4.015kg at birth and I had a natural birth. Don’t be too nervous. And if it is an option you’re willing to explore, an epidural might help as this is your first :) you’ve got this!!!
Don't worry! The estimated weight is never accurate. My friend had all her babies had 4kg & above and 5 of her births were vaginal birth. 2 tips : Don't scream and never lift up your butt while pushing to avoid a big tear.