Missing period

Ka

Does anyone have any recommendations on how to start my period?? I’m not stressed out, I did lose 30 pounds in a healthy way in about 5 months. Before I lost some weight, I was having a period every month within a day or two of expectancy. I am on birth control that’s supposed to regulate my period and I’m on metformin. I am 3 months late and I’ve taken many pregnancy tests and they’ve all came out negative. I just want my period 🥺