I also did 10,000 trigger and got my true BFP at 11dp trigger. I have heard on some it can take up to 13 days but that is rare. I think this is the real deal for you!!! Congrats :)
The nurse told me the trigger can take 14 days to be gone completely, but I always got bfn by 12 days post trigger... Last month I got a strong positive at 14 days post trigger and it was the real thing. It sounds like yours could be a real BFP! Good luck!