A week ago I had sex with my boyfriend and the condom broke, I took the Plan B one step 2 days later and I had 36 hours left when I took it. Starting yesterday I started to bleed a little bit, but it was enough to ruin my underwear. It's really light bleeding and I'm still bleeding today. I still have 11 days left until my expected period, but I know after taking Plan B your period can either come on earlier or later. I want to know is this my period or is this a plan B side effect?