Had sex 4/5 days before apparent ovulation date failed condom took plan b the day after missed one pill in beginning of pack took next day am i in the safe window?

Depends: Studies show it depends on the type of pill progestin only or combined contraceptive pill, and the time of the cycle.. See attached: https://health.cornell.edu/sites/health/files/pdf-library/missed-birth-control-pill.pdf Consider an IUD, insert and forget for the most part for several years of birth control. No pills to take. Good luck.