please help:)

so, my boyfriend and i had sex on the 19th. it was protected, but the condom came off inside me. i’m not on any kind of birth control. the cum stayed inside the condom and it apparently, as my boyfriend says, was sealed up at the end from me squeezing it. anyways, we checked afterwards and there wasn’t any inside of me, but there was in the condom. i took a shower and peed immediately after. i took a take action pill (plan b alternative) he next morning. i wasn’t ovulating and my period is supposed to start tomorrow. i know that the pill can delay your cycle by a few days and can even delay it for up to two weeks. i’m trying my best to stay calm, but i’m extremely scared. is there any way u could be pregnant???