As per the app i ovulated 15th february 2018 but condom broke on the 17th february 2018. will plan b still work as effective if taken 30 mom's after?

30 mom's?: Plan B works very well when taken the day of sex or the day after sex. However, very well is not perfect (and nothing in this world is perfect), so there is a small chance of pregnancy. Plan B can alter one's menstrual bleeding for 1-2 cycles, so a late period doesn't necessarily mean a pregnancy. One should do a home pregnancy test 3 weeks after sex, to see if there is a pregnancy.