Plan b

Is it normal to feel tired the next 4-5 days or so after taking Plan B? I feel a bit nauseous as well but only after/while working out, should I take a pregnancy test ?

UPDATE- I am 16, and I am not ready for a kid. Do you think I’m fine? I’ve also been feeling weird and not like myself lately , kinda worried. That might also be due to stress and sadness.