I took plan b one step and i'm having light red/brown discharge. this is happening only a few days after taking it.is this normal? will i be alright?

Infection?: You may have a pelvic infection including std. See your gyn and get discharged checked.

Yes: The emergency hormonal contraceptives such as Plan B disrupt your normal hormonal cycle and therefore cause abnormal bleeding. You should be alright but noe is the time to look into starting a more reliable method of contraception and to use condoms to decrease the risk of STDs. Hope this helps.