kelly, how hard this must be for you... i know several people with downs, and just wanted to let you know that they all seem to be living fulfilling lives. as you have decided to keep the baby regardless, i just want to tell you about a couple of lovely people i know who have downs syndrome.
the first person i knew to have downs, is my scoolfriend's older brother. he is quite severely affected, is hard to understand vocally and cannot live on his own without supervision. but he is such a loving and affectionate person. he can be very demanding and his mother has had to fight hard to get the best for him, i won't deny that. but he is accepted by the community, in fact i think he has tought people the importance of tolerance and love. at school everyone would do their best to include him in activities, and this goes on now he's in his late 20s. i don't think he has a less fulfilling life than any other person.
i also know a little girl who is 10. she seems to have a milder form of downs, and is also a very affectionate person. she is in a "normal" (i hate to use that word!) class at school, and with extra lessons and help she manages to keep up with her peers. she reads and writes, and can formulate herself very well. i believe when she grows up, she will be able to cope living on her own with minimum supervision, and lead a life very similar to you and me.
"normal" is a relative term. what is normal anyway? a baby with downs will be as loved as a baby without downs, and will bring you a lot of love, joy and happiness. if you find out that your baby has downs syndrome, i would advise you to get in touch with other parents of children with downs and build a network where you can get advice. perhaps also see if you can meet some people who have downs, and learn about the syndrome and how it affects the person. it's a harsh world - people are prejudiced of things/situations they are not accustomed to, but being different is not bad. be open about things, let people ask questions - that way they have no reason to be judgemental.
sorry to rant on... hope the results come back fine for you, but in any case just fight for the best for your baby - downs or no downs!