So worried about my baby

Found out my baby has a bit larger ventricular in her brain could be an infection or she could be mentally retarded they tested me for everything after the apt so I'm just supposed to wait and see . How am I supposed to sit around and wait to find out if there is something with my liltle girl it's a terrible feeling and I always think the worse in every situation. The doctor did say she had a gut feeling everything was fine but she wanted me tested anyways just to be sure and if there is something wrong better to know then later.