I've had sex with my boyfriend (anal and vaginal) and none of the condoms have broken but my periods are abnormally irregular and I fear I'm pregnant?

Condoms. Condoms are not 100%. Take ocp or other forms of contraceptives. If you enjoy sex of any kind with another person, you are both responsible for the possibility of being pregnant. Get a pregnancy test. Know that irregular periods does not automatically mean pregnancy. Watch out for std's, hiv, hep a, b, c, d, etc other serious illness associated with sex.