Alexis Mac Allister struck a late winner for the triumph at the City Ground.
Slot said, "My emotions were emotions of happiness and relief. This is probably the first time I have to do a different post-match press conference than I did throughout all these other games, because today we did not play a good game. The performance, especially in the first half, was not as we've had so many times this season.
"But we've been on the wrong side of the score after a good performance far too many times. Today, I think we got more than we deserved. A draw would have been a fairer result of this game than for us to win it.
"But then you think you win it because Hugo (Ekitike) already got a big, big, big chance from a great cross from Rio Ngumoha, misses it, the ball comes back, goes into the net. Since VAR is there, I always struggle to celebrate too much if I think, 'There might be something going on.' You never know if a ball has hit the body where it ended up. Apparently it ended up on his arm, so it was disallowed.
"Then my emotions were, 'OK, still not everything that could have gone against us this season has happened yet. Still one more to go.' But maybe fortune has changed two or three minutes later where again we thought we scored the winner, again they took a long time to check it, but this time the referee pointed at the kick-off – which meant that we won the game."