Plan b

I had unprotected sex on the 14th of this month (Saturday) and we used the pull out method and he ended up busting on me but not inside of me although it was dripping while my legs were spread open 💀. The next day (Sunday) i was suppose to get my period and i didnt. i wasnt willing to wait around and wait just to see if i was just late on my period so my boyfriend and I didn’t waste any time and immediately went and got me the plan b pill. I did read the side effects and how affective the pill is, for example it could set my period off for a week or so. Today is day 3 and i haven’t gotten my period so does that mean it’s working or should i be concerned? I just get really bad anxiety and need reassurance.