Implantation bleeding

Elizabeth
I am due my period tomorrow  but usually start spotting 2-4 days previous but today I noticed light brown discharge with bit of mucus sorry TMI!! It's only when I wiped (I don't need a pad or pantyliner) 
Could any of you ladies help me out. I'm not getting any cramps or feeling whatsoever. 
I have come abroad for a holiday could after all this time trying...could I be pregnant. 
Can't get to a chemist for next couple of days so can't do a test just yet!! :-/