Hello everyone. I'm still not having my period, when should I expect them?

Hello everyone. I'm still not having my period, when should I expect them? I'm still breastfeeding, the test is negative, and my daughter came over when she was 7 months old. When I had an ultrasound in August, the sonographer said that my period starts or has passed, I told him I don't have one. Who has their periods when? Of course it's cool without periods, but it's already bothering me.