I have a cyst that covers my urethra found 2 days before I gave birth (now 4months pp)was pea size now marble sized no one seems concerned but me?

Get second opinion. It may not be concerning in the sense that its may just be a benign cyst, yet anything that's growing or bothering you deserves to be evaluated. Cysts are typically easy treated by an OB/Gyn by drainage or excision. good luck.