Plan B

So me and my boyfriend has sex about a month ago and the condom broke, which we didn't know until after it happened. He pulled out but it still went all over me, I took plan B within 30 minutes and bled a few days after. I've had like brownish discharge/blood in place of my period recently but only lasted a couple of days. I haven't had a normal period yet & it's been over a month. Should I be worried? Or could it just be the hormones from Plan B messing up my cycle?