Is this normal for a second period?

I'm 13 and i was curious so i used my moms vibrator 2 weeks ago.I put a condom on it but I didnt wipe it off first.I was scared that I was prego wen my second period was late. I got it saturday full on.A ton of blood.and then I had it full on sunday too.Now today I am having brown discharge and spotting. This is only my second period.Could I be prego cuz i dont no if my mom and her bf use the vibrator for and stuff so could i be prego or is this normal for a second period???Please help im so scared i havent told my mom cuz i no tht she would freak out.Im so scared please help...