Help...

Okay so I'm pretty positive I had a faint positive. I started bleeding suddenly on the 12th no cramps or anything just a really sharp pain and then gush. (Sorry) anyway this is the exact same thing that happened during my 3rd miscarriage. Also I'm still bleeding heavily and passing very large clots and it's stopped twice completely. And the blood on my pad is black, something I've never seen before. I've made an appointment but they can't see me until the 3rd of January, and I've been through this ( if it's another miscarriage) so it's not E.R. bad.