Metformin ER, No Period yet

Hello! I started metformin ER twice a day in Oct. 2024. I was tested for insulin resistance and it came out that my levels were a bit high. I'm not diabetic either. My PA and PCP told me it would be best to start Metformin to help with my weight and it has! I've lost 15 pounds but I haven't been taking it consistently either and I think this could be one of the sole reasons why my cycle is out of whack. Before taking Metformin, I was getting my periods irregularly but I would still get them and sense my PMS symptoms beforehand. Now I can't tell if it's stress of the Metformin and I haven't gotten my period since Sept. 2024. Wondering if anyone has had a similar experience or any advice ? I really don't want to stop taking it since it's been helping me with my weight loss but I do miss having my periods and knowing that it's there still.