Implantation bleeding???

I'm a bit confused, these past two weeks i have been testing positive on hpt but they were very faint thin lines, i've been testing with digital and it comes up negative even though there is four lines on the two strips. anywho today i went to the bathroom and wiped and there was a brown pink on the toilet paper. I read this could mean 6 to 12 days of conception which sounds about right. but i'm confused if i tested negative on the blood test could i still be? or is this like a 2 week early period? i need help!!! i'm so confused and lost right now!! i kinda need to know because i take some medications that would cause problems and i don't want to hurt the baby. if anyone could give me information let me know!!! thank you in advanced!!! (: