Possibly Pregnant.. Questions about early signs!

Tiffany
I posted this earlier in health & lifestyle but I'm thinking this category will get me some responses.. Valentine's night I had awesome sex with my boyfriend of about a year that ended with him cumming inside of me (a first for us or any guy I've been with actually). I woke up this morning feeling a little weak like maybe I was still tired. I went to the bathroom and started my period with a light amount of blood which seemed normal enough because my first day is always very light. The only problem is that I am 10 days early and have never had such a huge fluctuation in my cycle. I read online that spotting can occur as early as 6 days after conception and seeing as today is the 6th day I can't help but wonder if this could be the implantation bleeding that occurs sometimes. Does anyone have any experiences they can share/ advice on how to know for sure? I've already decided not to drink caffeine or alcohol until I've taken a test. Let me know what y'all think...