I wrote a couple of days ago saying how i got what appeard to be my period but since I recently had taken a couple doses of plan b I wasn't sure. I had asked if its possible to be implantation bleeding since it started out dark and went to bright red and wasn't heavy as usual. Most said this was not implantation bleeding. The period i had is almost over but I took a pregnancy test today (while still bleeding a bit) and within a few minutes got a negative on the test. Its been nine days since i had sex so I'm guessing this is an accurate answer to my question , right?