CREATE TABLE table_name_53 (week INTEGER, time__cst_ VARCHAR(255), game_site VARCHAR(255))
What is the lowest week that has 7:15 p.m. as the time (cst) and fedexfield as the game site?
    
SQL: SELECT MIN(week) FROM table_name_53 WHERE time__cst_ = "7:15 p.m." AND game_site = "fedexfield"