My parents are going away, and they have NEVER caught me sneaking out before... Why do I have the feeling of dread?

My parents are going away this weekend, and I've never been given the opportunity to stay home alone before, because how ironic is it? Every time I sneak out they never catch me, but the one time I have the chance to, legally, stay home alone, I have this sinking feeling that they'll find out about all the times that I snuck out.