Oh love,
understandibully this is a difficult time for you, but as mistykins says you really must try to remain possitive... worrying will only cause you and your healthy baby much stress. I too have not been in your personal situation, but again as mistykins says (shes always right that one :snigger

if it would make you feel more at ease go have the scan, i appreciate that this would be a big step for you to take, but im sure you would feel much better having taken it to be told your baby is fine and settling in to your womb just fine.
look at it like this.... your going to the scan because you want to follow your babies every bit of progress, so you can express just how much he/she ment to you when he/she was developing.. get as many pics as poss and your child will be extra special when sharing their story and photos of theirselfs developing to friends at school... coz that IS what will happen, because there is now no room for negititivity in his/her mummys mind.
chin up hun..... your going to be a mummy xx