Period or not??? Implantation bleeding?

Ok so glow says I'm supposed to start tomorrow...I have been starting though normally on the 24th of every month. This month on the 24th I had some spotting it was brown but only when I wiped. The 25th I got only twice some light/bright red(only when wiped) the rest of the time it was brown no tampon or pad even needed it lasted for about 3 days of just brown discharge. I haven't had any cramps I have been feeling neaous off and on, really irritable and have been having headaches. .. I took 2 prego test both negative. Did I possibly have my period or implantation bleeding? My body feels different..we are ttc for our 2nd. Any info on implantation bleeding would be helpful! =)