You're not the only arse.
I knackered the first go too, however, it depends on your state of mind, I knew that my failure was a bad day at the office and that I was capable of passing, so i took first series, second attempt and got it.
A friend of mine did that a week before as well.
It' up to you, going to the second series gives you a buffer, trying attempt two is a bit of a drink in the last chance saloon - it all depends how you feel about your flying.
All the best Mark.