I took the index of your words, transformed the variety to binary, included three zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to convert it to binary, included a few zeros to the eight digits of your binary and received 00000010011 which translates to 19 in https://1001bookmarks.com/story18688624/getting-my-bip39-words-to-numbers-to-work