i've had metho, PinkElephant. It's hard to get specific info on it, as i recall, because a lot of people have different experiences on it.
i'll tell you mine, if it'll help. Started with some bleeding, couldn't see anythign on a scan, did serial Hcgs and the levels were found to be low and not doubling - gutted doesn't cover it.
they gave me the injection, sent me home and told me there might be some 'separation pain' as the baby came off the tube and that i should expect some bleeding.
well... there was more than some pain in my case... it was really bad. i'm not saying that to scare you, just so that you know. i did panic that i was going to see the baby somehow, but really the blood is mostly the lining of the womb so the chances are infinitesimal to zero of that happening.
i knew from the scan that the lining of my womb was 'nice and thick' (although it was bugger all use to me or the baby, she says bitterly) so the clots were quite substantial. if you are worried about that then you can put it to one side i hope, it's not at all likely.
people don't talk about this stage as a miscarriage, but i've spoken to friends who have lost babies through miscarriage and it sounds very similar. the lining of your womb has to go somewhere, so it comes out as a period-like bleeding. however, because i had such a thick lining there were clots, and because my cervix was tight shut (because my body was still pregnant, iykwim?) the clots irritated the cervix and forced it to open up to let them out. this was very, very painful. Take paracetamol or anythign else you can get your hands on, try hot baths and a hot water bottle on your back.
don't try to be brave, PinkElephant, you moan and shout and cry and grieve your head off if that's what you want to do. it's what i did, that's for sure.
And can i tell you something? No one understands unless they've been through it. that's why the EPT website is so life-saving. an ep is similar to a miscarriage but not the same. neverhteless, miscarriages are sadly more common, so a lot of people will talk to you about them. inside you might find yourself screaming 'it's not the same, my tube might not be okay, this might happen again... etc etc' but i'd try to let people help you with whatever they have to offer. pain is pain, and help is help, in whatever form it comes.
how is your partner doing? mine didn't have a clue what to do, the poor lamb... he was so frightened for me. and by me, because like i said i didn't hold back from the grief...
god, this has become a bit of an essay. sorry. ask me anything you like and i'll try to help. once again, i'm so sorry that you've lost your wee baby.