Is my birth control ortho micronor (norethindrone) still in effect if my boyfriend ejaculates in me? My period is 3 days late. I have premenstrual symptoms, no period

Yes. If you have not missed a pill then your birth control should still be in effect. Birth control is not 100% though so i would take a test. If the test is negative then feel reassured - sometimes you don't build up enough of a lining to get a period.