Unprotected sex

Patient: Hello.I had unprotected sex with my boyfriend yesterday. He pulled it out before ejaculation however I know there is something called pre-cum. I’ve checked my fertile days and according to the first day of my period which was on the 17th March, they will start on Friday 28th. Is it still possible that I could get pregnant even if not having fertile days and when he pulled it out before ejaculation? I am worried…I am 20 years old..