i went through something VERY similar to this, and im very sorry for your terribly sad loss. :( i know how you feel.
i was supposedly around 7 weeks along, and my doc was having a hard time with the ultrasounds. she had the hospitol do a better one - and the techs didnt tell me anything then - they told me to wait for my doctor to talk to me about them after she reviewed them - basically, it didnt work out - it was going to be a miscarriage. this was on the 18th of december 2005.
she told me i could either wait for the miscarriage to start on its own, which could take anywhere from hours to a week or so; or i could schedule a d&c - where they get the tissue out - it ensures that all the pieces get out, and reduces the amount and time that i would bleed since they remove most of the tissue themselves. i guess they also would examine the tissue to make sure that there wasnt any concerns there, and the hospitol has a spot in the cemetary that they later bury the tissue. they give us a packet after the d&c and they have memorial services once a year for the miscarriage and lost baby moms and dads, and they also tell you where the spot at the cemetary is so we could visit it.
we chose the d&c because it was dec 18, and i didnt want a miscarriage to start on Christmas, i would rather my doc just take care of it so i could move on, instead of waiting and wondering when it was going to start - also, living an hour from the nearest reliable hospitol/clinic i was afraid that if i were home alone and something went wrong, things could be dangerous. my d&c was performed on dec 22.
i really do suggest you and your husband have a discussion with your doctor. my doctor was really kind, and cried with us as we tried to make it through this time. a doctor of any other response, or one that is unwilling to make YOU the priority would then give you a good reason to find another doctor who will deal with this with the sensitivity that he/she should.
im VERY sorry for this horrible loss. dont let anyone minimize your feelings, this is no different than losing a baby - even if it was just the hope of a baby. i know what you are going through. people say all those things, you know, 'you will get pregnant again' 'things work out for the best' 'it just wasnt time' all of that - mostly because they dont know what else to say, so try not to be hurt by their seeming dismissal of your struggle. its just what people say you know? talk to your doctor about a program like i described, a memorial service for miscarriage/stillbirth/infant death, that kind of thing. however you decide to deal with this miscarriage, have peace that you will never forget this, but you will move on.
if you feel comfortable with it - i highly recommend the d&c. it wasnt uncomfortable (except the being numb and put out part - i have some flashes of things but im not sure i was ever with it and the fact that my husband couldnt be there for me that day... :( ) and it gave me the peace of mind that it was over, i could start over, and i didnt have to worry about hemmoraging or anything being we are so far from town. its really up to you.
the best part about all this is that almost exactly 3 months later we did get pregnant again, and by the anniversary of our miscarriage d&c, we had welcomed our little boy into the world. a miscarriage, though painful, is proof that you can get pregnant, its almost like your body takes some practice. you already know this i spose because you have a son already, but maybe your body just wasnt ready yet - or even still, maybe the baby would never have been healthy. again, this is just things people will say to you because they dont know what to say, but for some reason it helped me to think of it this way: all babies start out as on cell. that cell splits to 2, then 4... and if any one of those 4 cells arent perfect, the pregnancy will end. everyone whos trying to get pregnant will say that they would love a child no matter the disability, but sometimes i feel that its better when the pregnancy ends.
i dont know if you are a religious person. if you are, remember that God is taking care of us, and i believe, for some reason, that even miscarriages could be real, true babies, and if so, they will be in heaven. i dont know if that helps you at all, but it helped me.
good luck. im really sorry for this loss, let yourself mourn, dont be surprised how intense of emotions you can have. take some time off if you feel you need it, and dont exactly try to get pregnant for about 3 months to just let your body recover completely... all that. if you just need to talk, you can send me a note, im willing to listen. ive been there, i know how it can make a person feel.
anyway.
i dont know what else to say. everything will be ok. you will be sad, thats MORE than ok. do what you can, be easy on yourself.