Implantation bleeding - Please help!

Sunday, October 11, I woke up and found a tiny  light pink blood on my underwear and I was kind of confused because I know this is extremely early. My period Always comes on time if not maybe one day early or one late SOMETIMES!!

I googled what this could be and it came up with implantation bleeding. Exactly what Google said I should expect during implantation bleeding is exactly what I was experiencing light spotting, and it was very very very brown the first day and second day. The night of the first day I was having really bad cramps like the way I do when I have my period. But I knew this wasn't usual because it was very light and brown. My husband and I had sex four days out of my ovulating days and I am trying to figure out how many women experience implantation bleeding and tested positive after and how long did you wait to take a test that came up positive. I told some my close friends and sisters. Cousins they are all saying I could be pregnant, but i'm trying to see how many women actually went through this and tested positive after.