Girls good evening) My acquaintance gave birth not long ago, her baby …

Girls good evening) My acquaintance gave birth not long ago, her baby was born sunny, she was born during pregnancy, this acquaintance had a lot of arguments with her husband and she had stress when she did ultrasound they told her that everything is fine, second trimester such a girl was born, question in what? My thoughts are like this, what if I give birth to a Down syndrome child these thoughts do not leave me, what should I do, it was said at the ultrasound that everything is fine...