Pleural effusion in fetus week 22

Trisha
I went for my snongram old during the 20th week and it's a girl. They said they wanted me to come back 3 weeks later to take another look at the heart. We did and now in my chart it states pleural effusion. They are not to concern but I have another snongram in 2 weeks. Oct 16. Has anyone gone through this.