My period is 30 days late, its usually irregular but this is the latest its been in a while. i had unprotected sex today, but he didnt finish inside me. im scared i could become pregnant. is that possible with the info i have provided?

Yes, pregnancy may be possible. Irregular periods certainly make it harder to be confident of ovulation time. Even with perfectly regular periods, relying on fertile/infertile periods ("rhythm method") or withdrawal before ejaculation very often eventually fail to prevent pregnancy. You're playing with pregnancy fire! Get on proper contraception ASAP. Also use condoms to prevent STIs.

It is always probable that you may get pregnant with unprotected sex, even if you use the "pull out" method. A simple pregnancy test in 1-2 weeks will tell you if you are.