So I'm a little worried....

Alright so just a heads up, this post may be a little long so I apologize in advance. I am a first time mom and currently 25 weeks 2 days pregnant. When I was approximately 21 weeks I went for my anatomy scan, we found out we're having a very active baby girl! I went for my follow up appointment shortly after with my doctor and at the time she told me everything was okay, but they wanted to set up another ultrasound to take another look at my little girls brain. A very long and stressful 4 weeks later, I just had my repeat ultrasound this past Monday. Again, she looked great and was very active! I went back for another follow up with my doctor today and to get the results. She tells me that they wanted to take another look because they saw cysts on my baby's brain at the first ultrasound and wanted to see if they had gone away. She said that she still has 2 small choroid plexus cysts but the other 2 had went away and that these 2 "hopefully should as well". I'm trying my best not to worry but it's so hard! She never said if they planned on doing another ultrasound to see if they've gone away or not. I'm freaking out! Has anyone else been through this?!