My friend and I are making our first homebrew and we have everything in our primary fermenter and he took the first OG reading and it turns out, the pot was too shallow for the hydrometer so we have no Idea what it was before we put it in the carboy. Are we screwed, or would it be possible to tell when the fermentation is complete by just taking readings until it stops changing? Or does the first OG reading just give you something to compare to the last so you have a clue what the ABV is in the end?