Hi, I had recently had unprotected anal sex with my boyfriend on the 9th of April, the 3rd day of my period. I took the morning after pill 19 hours later... I'm usually irregular but now my calendar app says I'm 3 days late. I have been having cramps as if I'm having my period already but there's no blood coming out. Only a yellowish discharge. Is my period delayed because I'm pregnant or is it because of the morning after pill?