AF or implantation?

Erica
I had brown spotting 10 dpo for two days. Then it turned into a bright red on the third day. I checked my cervix on all those days and it was high and blood clots came out with it. Now it's a light pink and after 6 hours the tampon I put in isn't even halfway filled. 
Anyone know what this is?
Could I really get AF 10 days early? I normally have a 33 day cycle.