Early period..?

Samantha
So I'm not supposed to have my period for about another 6 days. My husband and I were on vacation and had sex (unprotected) on our very last day, which was March 1st. Last night I started bleeding and thought I started my period, but because of the timing of when I started bleeding and when I had sex last I was thinking it could be implantation bleeding. 
The only problem is it just feels like a light period. the color is more lighter and I'm not bleeding much. But it also seems heavier than what I've read on IB. I read it's just tiny spotting. Maybe I'm being paranoid here?