Im A Teenage Girl That Recently Had Very Quick Unprotected

im a teenage girl that recently had very quick unprotected sex with my boyfriend. he wanted to know how it felt without a condom so i agreed. he only went in once and right back out. he wasnt even in for 10 seconds. but being paranoid, he went to the bathroom and squeezed his penis and a very little bit of pre ejaculation came out, is it possible for me to be pregnant?