I’m 4 weeks and 4 days pregnant. I got my first faint positive line six days ago and it’s got darker everyday. Today I noticed a couple of drops of brown blood in my underwear. I phoned my GP who said it could just be implantation bleeding. Does that happen this late? I assumed it happened before you get your positive. Recently had a miscarriage at 8 weeks and it started in a very similar way so I’m not convinced :( any help would be very much appreciated!