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And any info I volunteer on the pre test questions is the same as a confession, correct?

It's normal for people to make minor admissions to the "control" questions during the "pre-test" phase of a polygraph examination, for example, to having taken small amounts of office supplies home from work, or to having lied to loved ones on certain occasions. But such admissions are not likely to be disqualifying.

On the other hand, changing answers to relevant questions after the "pre-test" phase may well result in disqualification. For example, if one has stated that one smoked marijuana three times and then changes one's answer to "less than ten" times, that may be taken as an indication of dishonesty and used as grounds for disqualification.