J.B.
I would get some tea tree oil shampoo as an extra precaution and just keep looking for signs. Some people say that tea tree oil to treat or prevent lice is a myth but I have a friend who ran a large daycare center who always had her daughter shampoo with tea tree oil and so far she's never had lice, even with outbreaks at daycare and later, at school.
Hopefully you avoided it!