Period while breastfeeding?

Curious what other moms periods have been like while breastfeeding? My first one was a random two day period and then I didn’t have another one for almost two months. And that one was a full blown 6/7 day period. Then last month is was two days early according to my app and once again it was a normal period. This month I’m two days late according to the app. I did have unprotected sex one time but it was 4 days after my period ended so I wasn’t too worried about getting pregnant. So hopefully this is just the norm for breastfeeding periods.