FTM with GD

Hello mamas! FTM here with rainbow baby at 18 weeks! My partner and I are so happy and excited to meet our miracle in October! We don't know what we're having yet.
I was diagnosed with GD at 10 weeks, it was a change in my eating and more exercising. I have been good with keeping up with my sugars since then. 
When I had my ultrasound my ob/gyn had found a cyst near my uterus😔. It was scary because I didn't know what to expect and I don't want anything to happen our baby. My ob/gyn have been keeping a close eye on it from the ultrasounds. It's hasn't grown since then and doesn't seem to be cancerous. However, I was asked if I wanted to leave cyst in there or have it be removed. I decided to have it removed but they are saying their is a risk of losing baby or having a preterm birth. I don't want that to happen. 
My question is have any of you know or gone through a procedure like this? 
My procedure is scheduled next week, I'm a bit worried and scared but I'm keeping positive and I know baby will be okay. Please keep me and baby in your prayers💜