Hi Worried,
Really feel for you. I can't promise you'll be okay but I'm in a similar situation and sharing my experience might give you a bit of reassurance to get you through to your scan.
So Tuesday evening (at 10+4) had lose bowel movement (a first for me as I've been constipated the whole pregnancy due to cyclogest) and some cramping, then Wednesday morning found brown discharge when I went to the toilet.
Called epu who booked me in for scan that day. Baby fine, waving arms around and quite lively. Sonographer advised rest until bleeding stops. I was so relived at the time I didn't even think to ask what might've caused it, or request an internal exam. More loose bowel movements that night, then woke up just after midnight gushing red blood. Totally panicked thinking it was all over. Couldn't get through to epu so called nhs direct who sent an ambulance. After a 3 hour wait at epu finally got an internal exam. Doctor confirmed cervix was closed but said there was an old blood clot on my cervix that was coming away and was nothing to worry about. Not pregnancy related at all. They don't want to see me again unless I get severe cramping.
Still bleeding today, not as much but a lot more than just when I wipe. It has gone back to being very dark brown (almost black), old blood. I'm still worrying of course but consoling myself with the fact that there's little pain, just the normal pregnancy cramping I'd gotten used to (and was ignoring before the bleed). Nothing I can do now until dating scan in a fortnight.
Given how long you've been having the brown discharge I'd think an mc is unlikely. Surely if it were the start of one it would have progressed by now? If you don't want to wait any longer try calling your epu - they may allow you to self refer, especially if you explain how much it's affecting you emotionally.
Sorry for the long post but hope it reassures you a bit. Many things other than mc can cause bleeding in pregnancy but any bleeding should always be checked out.
Keeping everything crossed for you for a good outcome.