If you are saying that your boyfriend touches your vagina with his penis, but does not enter you, then yes. There is a small chance of pregnancy.
From the minute a penis becomes hard, it leaks a tiny amount of fluid called 'pre-cum'. Pre-cum has thousands of sperm in it, so it's possibile to get pregnant from this even if the guy never cums.
This is risky behaviour; a safer option would be to have him wear a condom if you wanted to do this.
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