Plan b after 72 hours

Sa

Me and my SO had sex on the 21st and he came in me then the next day he came in me which is the 22nd and the 23rd he came in me a little bit. Basically we were supposed to take the plan b by Monday and I didn’t get it until Tuesday but my period is due in 7 days and we did it after my last fertile day on my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> calendar. Is there a chance I could get pregnant. In my head I’m like it’s no way since I have a history of 2 miscarriages and my period was gonna come soon so I wasn’t really tripping about it. I just want to know ig if it’s possible and if me taking the plan b after 72hrs is going to effect the pill from not working