Could a liitle bit of precum on finger gets me pregnant?

If he touched his precum and then placed it around or inside your vagina, then it is possible that you could become pregnant. Chances are lower than with ejaculation and penetration, but still possible. He'd have to be a man who has sperm in his precum. A study by Human Fertility, showed that some do and some don't, but those who do have sperm in their precum, always have it there, regardless of whether they've recently ejaculated or not.

You may also have been exposed to any sexually transmitted disease that he may be carrying, some of which can be carried without symptoms, for some time, and by virgins. You may want to get tested.

You don't have holes in your hymen. Your hymen is a piece of skin that partially covers the entrance to the vagina. It breaks during intercourse, or sometimes sooner in some women.

Hopefully, if there is any chance of pregnancy, the Plan B will manage to stop that. It's not guaranteed, but worth a try.