sunnydays123, have you gotten any other results in? I lost my little girl to trisomy 18, and I know how scary it is to go through all the possibilities. They though she was just small, there was only one artery in the umbilical cord, and she had a cyst on her brain at 20 weeks that was gone by 26 weeks, but that is a soft marker. Still, my doctors didn't suspect anything else wrong until she was born at 29 weeks 1 day with birth defects on her hands and feet. We found out later that week she also had 3 heart defects. They didn't see any of these things on ultrasound. She was perfect to us and we had 6 days with her. We didn't find out it was trisomy 18 for sure until the last day of her life.
I know it is scary, but there is more of a chance that your baby is okay than there is something wrong. I am pregnant wit baby number 2, got pregnant 6 months after we lost our daughter, and so far, all the test have been great. We were given a 1 in 100,000 risk of trisomy 18 at our NT, also, low risk of downs.
I hope and pray everything is good with you and your baby. If you ever need to talk about results, or need information, or anything, I'm around.