I took the index from the words, transformed the amount to binary, added a few zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to convert it to binary, added 3 zeros to your 8 digits of the binary and received 00000010011 which translates to 19 in https://hindibookmark.com/story20473672/not-known-factual-statements-about-bip39-explained