Precum can get you pregnant
Any liquid that comes out of the man's penis can have sperm in it. During foreplay or sex a man can have precum coming out of his penis. The precum can contain sperm in it and it can get your pregnant. It wont have as much sperm as an ejaculation does but it can still have sperm. If you do not want to get pregnant his penis should not get anywhere near your vagina at any point without protection.