A late Teddy Jenks goal deep into extra time secured a 3-2 victory for Brighton over Worthing.
Worthing were held to a draw by Potter's Bar despite a dominant showing.
Worthing defeated Sussex rivals Lewes 3-1 at The Dripping Pan, to secure their first win in four.
Cheshunt scored three second half goals to beat Worthing in the Velocity Trophy Quarter-Final.
Ricky Aguiar scored the only goal of the game as Worthing overcame a determined Bishop's Stortford.
Lloyd Dawes scored a 90th minute penalty to hand Worthing a 2-1 win away at Carshalton.
Worthing have continued their fine run of form with a 2-0 victory over 9-man Cheshunt at Woodside Road.
Worthing have progressed to the next round of the Velocity Trophy, after beating Leatherhead 2-0 at Woodside Road on Tuesday evening.