Derby County fans were optimistic that the Rams would be going to Wembley after the first half of the match ended 1-0.
Kevin Wright, 48, who originally is from South Normanton, has travelled from Australia to see the Rams in the playoffs.
He said: "I saw Brighton play away and I will be going to Wembley. I know we can get there.
"We are doing very well. The conditions are not great today, what with the rain."
Kevin is at the match with his nine-year-old daughter Danielle and his father Hedley.
Hedley Wright, 75, said he had been a Rams fan since 1977.
He said: "We are playing very well and we will be going to Wembley."
The iPro Stadium exploded with delight after the first goal of the game from Will Hughes.
Fans waved their black and white scarfs and flags as he celebrated.
And the midfielder's goal was well received on Twitter too.
Brandon said "What a finish!" and Yvonne Gorman said "GGGGOOOOAAAAALLLL! What's just happened to me? I actually punched the air."
Before kick-off fans in the stadium were giving their views on the game.
Matthew Barron, 13, said he predicted a 2-0 win.
He travelled from Hinckley, Leicestershire, with his dad Dominic, 46 to the match as well as his grandad Tony and grandmother Iris, 70.
The teenager, who is a goalkeeper for Bradford City under-13s said his favourite player was Rams goalkeeper Lee Grant.
He said: "I reckon we will win today. It would be brilliant to get to Wembley."
Matthew's grandad Tony Barron, 70, of Spondon said he had been a rams fan since the age of four.
He said: "I remember going to see Derby play at the
old baseball ground when I was four.
"I really hope they win today but the way they have been playing I think it will go to extra time and
penalties."
Fans Nigel and Michael Rea have travelled all the way from West Sussex for the game.
Nigel, 52, said: "My dad lived in Chellaston before he died and he was a big rams fan. The legacy now lives on with me and his grandson.
"All my family are from Derby. We have been Rams fans forever.
"I am confident that we will the second-leg against Brighton. We can't play any worse than we did the other day.
"I think today's score will be 2-0 but Michael thinks it will be 1-1."
For 49-year-old Lisa Howard, of Oakwood, today is a huge day.
The dedicated Rams fan said she had been to every match this season - whether it be home or away.
She said: "I have been a Rams fan for 15 years now. I have supported them since I was four-years-old.
"We deserve to go to Wembley. It would be unbelievable to get there.
"I am so proud of the lads for how they have played this season.
"I think today's score will be 3-1 but Brighton will score first, getting all of our nerves going."
Lisa said player Johnny Russell had really shone for her this season.
She said: "He has come on so much under Steve McClaren.
"He has been Mr Reliable 100% this season. He has been so committed."
