I had sex with my boyfriend on Aug 28, the last day of my ovulation period. On Sept 3-5, I had the faintest bright pink bleeding, which I only noticed when I wiped. I kind of thought this would be my implantation bleeding days... which proved accurate when doing the ovulation test online. On Sept 6 we had sex again. My period was suppose to come Sept 9.. it is now the 11, soon to be the 12. I still have not had my period and my test results are negative. Is it possible that I could be pregnant? Not from the August intercourse date, but the most recent.. just 3 days before my period was suppose to come?

It's possible, but if that's the case then it's way too early to test. That was only 9 days ago.

Wait another 2 weeks and then test again. Make sure to use first morning urine.

Agreedl I would even say it may take slightly longer than the two weeks, but that is a good time to start the test if no period is seen