Anyway to get period to start while breastfeeding?

My baby girl will be three months on the 20th and I still haven’t gotten my period. She is my rainbow after 2 losses and I want to try again for another when she is around 8 months old. She is strictly breast because she refuses a bottle or a passy. I feel weird not being able to track my period and ovulation while I’m not pregnant. Is there anything I can do to get my period to come that won’t effect my supply? I only worry because my cousin breast fed as well and didn’t start her period until her son was 13 months old.