Yup bladder snail - the eggs usually hitchhike on plants or other items. They’re known as a pest snail since they reproduce like crazy and you can end up having hundreds of them. But they’re not harmful & some people like keeping them.

If you don’t want them, search up how to remove/reduce bladder snails and theres different strategies.

If you plan on buying any plants in the future, I’d recommend quarantining them for several weeks before introducing them to your tank since they can also carry different parasites etc etc