Period spotting or implantation

Period, spotting or implantation I been spotting since Friday but I only see it when I wipe so I am not sure if this is my period or if it's still spotting my period was suppose to come today I took plan b 2 weeks ago and I was on birth control for 3 days but got off because it didn't agree with my body my boyfriend and I had sex but we used a condom and pulled out I'm not sure what's going on with my body my period are usually heavy but this is just a couple of spots can you guys tell me what u think sorry if it's TMI