Am I out?

Kari • TTC #1 for 5 years
I'm 13 dpo and yesterday I had light brown/pink spotting for a few hours. Put a tampon in thinking I was starting. Took it out later and there was light pink on the tip. Is this implantation or am I just about to get my period? My period was due today and no spotting at all. I did have a drop in temp. Does this mean anything?