TMI!!!! Helllppp please ladies, don't know what's happening:/

My Af is due on the 6/14-15 and I had some period like cramps starting from 4-5 dpo. I took a hpt (cheapest one ever) and it came out negative. This afternoon I saw on my panties a very small amount of brown discharge and very very small amount of blood. Could this be implantation? Got my period when I was 12 and since then it never came earlier then I expected it, always 2-3 days late. Any insight will be appreciated. Thank you ladies.