Some toenails fell off, but they looked clear. i am worried that it is toenail fungus. is it?

A culture of the: Nail would be positive if there was a fungus in the nail. Cultures are fairly accurate, but not 100%. There are several reasons a toenail would just fall off, but a fungal infection is not high up on the list. You can put the nail under your pillow before you go to sleep and the toenail fairy will leave you a dollar. It's also a good idea to see a podiatrist! good luck!

Not necessarily: There are many reasons for toenails to fall off. One of the most common, for apparently healthy toenails, is micro trauma. Are you a runner? Many runners lose their toenails often due to micro trauma to the nail.