I'm so worried about my baby.😓

I've found out he has a cyst in his brain. He had two but one is gone now. They did a detailed ultrasound and said everything is normal and he's in the 53rd percentile, 3 pounds 3oz at 31 weeks and told me my quad screen came back negative for anything. I'm just so worried he's going to have issues once he's born. I don't want my son to have any struggles in life and I'm hardly prepared to take care of a new baby (ftm), especially one with any disabilities or health issues. 😓 I'm worried because I heard the cysts are usually gone by 28 weeks, I'm almost 32 now and he still has some of one left. And even if they're gone, the risks still remain there. My heart feels broken.