What Causes Fibroids?

HI DOCTOR ,I HAD THE HISTORY OF DERMOID CYST 2005 ON MY LEFT OVARY AND IT WAS REMOVED THROUGH SURGERY. I AM 38 YRS OLD RIGHT NOW ,AND NO KIDS AT ALL .NEVER HAD ...NEVER BEEN PREGNANT ...AND I WANT TO ASK IF THE ONLY ONE RIGHT OVARY HAS A CHANCES FOR ME TO GET PREGNANT....BECAUSE I EXPERIENCE ALSO A IRREGULAR PERIOD...MY AGE IS ALREADY LATE BUT IM WILLING TO HAVE A CHILD ...WE BEEN MARRIED 9 YRS ....LATELY I PRESCRIBE A METFORMIN AND PROGYLUTON BY MY OBGYNE ,WHAT IS THIS SUPPOSE TO BE ,IS THIS THE PCOS MEDICINES ,AND SHE WAS TOLD ME THAT I HAVE A FIBROIDS ON THE ULTRASOUND CHECK UP ..SHE DONT TELL ME ABOUT MEFORMIN 500 FOR WHAT ...AND ALSO THE PROGYLUTON TAB...PLS HELP