Is this implantation bleeding or an precipitate term?

I had unprotected sex on the 19th of june. I was supposed to ovulate on the 18th. Over the past few days I hold had tender, sore breasts, horrible stomach cramps, and have been opinion really tired all the time. This morning, I started bleeding. However, my period is not due til july 2nd. It is red and it doesn't seem to be much, but my regular extent usually only lasts 2 days. The blood flow hasn't gotten any stronger today and I only used 2 pad all day. Is this implantation bleeding or an early interval? Please answer :]

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Answers:    If it's implantation, you should have a positive test in a couple of weeks.

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