Period or pregnant?


Hey guys so I am 3 days late for my period and normally if I'm late it's by 1 or 2 days but I've never gone 3 days late. My last period was October 3rd-7th. I had sex twice on the 21st and used the pull out method both times. I was supposed to start my period on the 26th and am now late. When I went to the bathroom this morning there was some light brown on the tp. Not sure if it's my period about to start or possibly implantation.... any advice?