Morty,
As children we had a horrid lice issue due to one family not purchasing the medicated shampoo and combing the nits out. Til this day.. I shiver and thinking about it makes my scalp itch! We had to perform the de-licing process so many times our hair turned a shade of purple. Finally my mom cut all our hair short.. much to our dismay. The school nurse would not take this girls braids out and look! Finally we had enough.. and we undid her braids yelling LOOK! ICK! those things were huge! The school was passing out free kits because it had become that much of an out break. The girl was finally sent home with a kit and was told not to return unless she was nit free!
I would purchase a nit comb they are very fine toothed and comb through your hair and inspect the comb. It is the only way to be sure, I would also use the shampoo as a preventative.
X.