Agree with everything all the other posters have said. Getting one thing slightly wrong on what wasn't even your real test is not the end of the world, so relax, go over it again with your instructor, and you'll be fine.
Just one thought - are you actually thinking about how you do a PFL while you're doing it? I don't know what method you've been taught, there are several. I was taught the "1000' point" method - pick somewhere which you want to be the start of a base leg, and aim to be over it at 1000'. If I screw up a PFL, there's a good chance that it's because I've forgotten to do this, and either just headed for that point without paying any attention to how high I am, or not even picked a point. Whatever method you've been taught, make sure you actively think about it as you're flying.
Good luck! And let us know how it goes!
FFF
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