I got cut off around 70 as well. This bugged the crap out of me, and it was a long 24 hours before I got the result: Passed.
But before I got word, I did a bit of research. The exam, as you know, looks for a certain level of proficiency at all levels. It starts with an "average" level type question, and subsequent questions are either of a higher or lower level depending on how you answered. The test stops when it is 95% certain you are above or below the required proficiency level.
So... do you remember the LAST question asked before the test sent you home? Do you know for certain if you got that one right or wrong? My theory is... that last question should tell you, because it is at that point the test reached the 95% certainty level. Got it right, you passed. Got it wrong... keep your fingers crossed.
I got that question right, so it helped me sleep that night.