URGENT QUESTION

So on Friday the seventeenth I had sex with my boyfriend and the condom broke. I am not on birth control, but I took a plan B one step immediately after it broke. I was supposed to have my period come on the eighteenth, so I was spotting on Friday. So after I took the plan b I put a tampon in. Will  having the tampon in possibly get me pregnant because the cum was possibly still inside me??? Also, I haven't gotten my period yet and still have brown spotting. This is normal, right? Please someone answer my questions thank you so much