this is the 4th time ive tried to type this, my computer keeps closing the page, but i'll try again lol
ive noticed on alot of other posts etc that some women have been given blood tests at gp's, a&e or epu when they started bleeding, to check the level of hormones. just to make sure they are normal. if they come back low i think they can warn you that it may be a m/c. which im sure they wont be. but maybe it be worth a trip to your community midwife at your gp's and asking about a blood test, it might help put your mind at rest abit until your scan anyway.
good luck x