Implantation bleeding or period?

Hi Ladies! According to Glow, I should be expecting my period in 3 days. However, I started spotting this morning. I believe it might have started late last night because while going pee I noticed a tiny bit of brown-ish discharge but wasn't sure what it was. And this morning I again noticed it while peeing. There was just a tiny bit of pink on the paper. I thought it was my period starting so I put a tampon but later on when I went to take it out there was only a small amount of blood, except this time it was a normal red - not pink or brown. And just now I went to the bathroom and had a few spots but that's it. It hasn't gotten any heavier than that. Is this probably just my period coming early? Sorry I did is too TMI!