I'm sorry for what you are going through.
The hormone that makes a positive increases every day during the first few weeks of pregnancy, reaches a peak at about 9-10 weeks, and then gradually tapers off, so much so, that you will probably get a negative result for the later part of pregnancy- the same hormone is linked to morning sicknes, which is why women are told they can expect to feel better by 12 weeks- becuse the hormone levels out by then.
So it's possible that you are still pregnant, but it's only a really slight chance, and with the bleeding and everything, and no heartbeat.... It doesn't look good. I hope I am wrong though. Do you still feel pregnant?
Ask for an ultrasound. Then you'll know for sure.
Good luck.