The waiting is horrible, you must be so worried.
Unfortunately it is true there is nothing they can do - 50% of early pregnancy bleeds go on to be miscarriages, 50% continue as viable pregnancies. I know it seems so hard that they can't give you any answers.
There are people here who understand and can hold your hand till your scan on Monday. Possibly you could choose to get this thread moved to the miscarriage topic. By saying that I am not presuming you will go on to Miscarry, which I realise you haven't yet and there is still hope for your baby, it is just there are lots of ladies on there who have been through your horrid wait and could support you.
I think Miscarriage is so awful and I feel so powerless that it is kind of a defence mechanism to try and blame myself for it in some way, as it gives me a feeling I have some kind of control, if that makes sense.
I have lost count of the number of things I have worried I have done/ not done/blamed myself for as a possible cause. You would probably laugh at some of them, they are so silly, but my head desperately wants to know 'why' and so it comes up with things- but you know, you really really aren't to blame, you didn't not cause this, it is not your fault for taking some time to get your head round the idea of pregnancy, this is entirely normal.
In the waiting I have found box sets of entertaining but low brow rubbish telly are quite a good distraction for a bit- didn't really want to go out and couldn't concentrate enough for books etc, but some telly did divert my mind for a bit.