Do I have lice in my hair??

So today my best friend's mom told me she thought her daughter, my best friend, had lice. She said since we hang out together, I probably do too. I've been paranoid since, but my hair doesn't itch, and even though the top of my scalp has dandruff, it's easy scratch out and get stuck in my nails. Just to be safe, I washed my pillow and used lice repelling shampoo when I took a shower a little while ago, but I still don't know. Does anyone know if I have lice? I really don't want to get my looked at unless everyone thinks I really do have lice. Thanks so much!