congrats on your pregnancy. I don't know about the numbers or stats. I didn't get a prenatal diagnosis but I did get a baby with DS. I know there are a lot of false positives with the odds and the tests. I wish you the best and an outcome you want.
I just want to tell you that is the worst possible scenerio that you are probably imaginging now, a baby with DS. Is NOT the end of the world. My Esther is our light. She is the youngest of my 7 and she is amazing. I wouldn't change her or her diagnosis for the world. Her brothers and sister adore her. She is naughty, funny and in her terrible twos. She is just a baby. The bottom line is they are just babies, very very special babies.
Who knows if perhaps you were made queen for just such a time as this? Esther 4:14
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A baby is a gift from God no matter the packaging.

Esther