PCOS advice…?

I got officially diagnosed with PCOS mid 2023 when we were trying for our last baby, lost weight got pregnant. Now baby is 9 months old and well… I got my after birth period at like 5weeks PP, all was fine and normal up until November… I had my period stop the very beginning of November and it didn’t come back until THIS WEEK. I’m 3 days in. Going by my app that I’ve used since before I had my oldest, I was 49 days late. What on earth changed??