The day after pill concern

Hey there, I'm posting this because I'm kind of worried about my period. I've been very irregular always. Like a month and a half ago I had unprotected sex and at the following day I took the day after pill. My period came 6 days after taking it; however, it hasn't show up anymore since then. Counting the days, my period it's being late for about 15 days and still. I've had sex but my bf is being using comdons. The question is: is that normal? Can it be a hormonal alteration caused by the pill? I don't have any physical symptoms. Thank youu