I HAVE PCOS TTC FOR 2 YEARS ON CHLOMID SHOULD I TAKE METFORMIN??? DESPERATELY NEED ANSWERS???

I HAVE HAD  PCOS FOR ABOUT 4 YEARS, AND IM 21 MY HUSBAND AND I HAVE BEEN TTC FOR NOW 2 YEARS I FIRST STATRTED OFF TAKING 50MG. OF CHLOMID I WASN'T NEVER REGULAR ON  MY PERIOD SO MY OBGYN TOLD ME TO START IT ASAP. BUT THAT DIDN'T MAKE ME OVULATE LET ALONE I DIDN'T EVEN GET MY PERIOD THEN MY OBGYN PUT ME ON AYGESTIN 5MG AND FINALLY AFTER 9 MONTHS GOING WITHOUT MY  PERIOD I GOT IT THEN ON DAY 3~7 TOOK CHLOMID 100MG AND I WAITED AND NOW ITS TIME FOR
A PREGNANCY TEST AND OF COURSE I GOT A BI FAT NEGATIVE... IM THINKING ABOUT TAKING METFORMIN WITH THE CHLOMID OR GOING STRAIGHT TO AN IUI. IS  THERE ANY OThER WOMEN OUT THERE THAT hAVE PCOS AND THAT ARE.TAKING THESE MEDS? OR ARE THERE ANY OTHER ALTERNATIVES??? PLEASE I DESPERATELY NEED ANSWERS???