Good luck! Hopefully it is a BFP. I tested before my period was due and got a negative, then I tested when my period was due, still BFN, it took 5 days after my period was due until I got that faint line I was talking about. As said by someone else, it just depends though how much hcg is in your body. Actually I didn't look at my tests after the 5-10 minutes, I'm kind of thinking I should have though!!! Oh well.
Good luck!! Hope AF stays away!