9 DPO is pretty early on. I got a BFN at 10 DPO. I had been TTC for so long and had been let down so many times with BFNs that I decided to hold off on testing again until a couple of days after AF was due. I didn't actually see my BFP until 18 DPO, but it was very positive by that point. I'm sure that it would've been positive a few days before then, but, obviously, it wasn't positive a week before then.