I got a faint bfp on 17/03. Followed by a definite bfp two days later (Top test on picture). Took another test this morning expecting to see a really dark line, but it's faded to hardly visible. (Bottom test on picture). I'm also getting rust colour creamy discharge (sorry) when I wipe. It's not good news is it?
NHS won't do anything at this early stage but I'd recommend going private, if you can afford it, check your HCG levels (they should double every 48 hrs or so, i think) and ask if you could be prescribed progesterone. It helped in my case - I had an early bleeding at 5w+4 and the progesterone stopped it. There may be lots of causes for the bleed and it doesn't necessarily mean it's a miscarriage, though of course possible..