Will I become pregnant ?

We used protection .. I was on top . When he asked me to get off the condom was stuck inside of me . He panicked and thinks he came inside of me but I don’t think so because I felt the condom slide off of him while I was lifting my body off of him . He checked the condom and all of his juices was there . Now four days later he wants me to take a plan b . In which I don’t even think I need 😩 my period and ovulation tracker says low fertility rate and I was expecting to ovulate the day after we had sex . What do you think ?