bunches,
If you had unprotected sexual intercourse and your partner ejaculated inside you, the pre-ejaculate is a moot point.
However, if he did not, then the chances of getting pregnant from the pre-ejaculate are very small. The pre-ejaculate is basically for lubrication, but it can contain some sperm. However, it takes millions of sperm to successfully fertilize an egg, even though only one actually does the fertilizing.
If you do not want to get pregnant, then you should always use birth control of some type. And since you are the one who will be pregnant, it is up to you to be the responsible one in the partnership.
Good luck.