plan b side effects?

so about three days ago i had sex and the condom broke, we didn’t realize until after he finished but he pulled out (for the most part). we immediately got a plan b and i took it right away, i also had just gotten out of my period but now i feel no side effects from the plan b. all of my friends have said that they had spotting or even cramps but i haven’t felt any different, does this mean that the plan b didn’t work or am i not the only one that has had no side effects from it?