Cycles After Tubal

I recently gave birth to my third child eight months ago. Whilst finishing up my csection I had a tubal ligation in order to prevent any future pregnancies.

For my entire life I have always had an undeviating menstrual cycle, even after my tubal. That is until now at 8/Mos PP because I am now sitting at 19 days late and this has never happened to me.

I guess what I’m getting at is are there any other ladies that have experienced this after a tubal? Even after having them regularly for the first several months after giving birth.

Side Note: My mother began going through “the change” in her late twenties which seems crazy young to me but I’m no doctor.. I am 33 and I obviously can’t help but to I’m wonder if that could be the cause of my missing period this month too.