If you have 2+ kids and you exclusively breastfed both.. When did your period return post partum? Was it similar both times?

I breastfed my son for 1 year. I think my period returned maybe 10-11 months post partum? It was great!

I thought it'd be similar this time around.. I'm exclusively breastfeeding my 11 week old.. And expecting to not ovulate til I'm 10-11 months again... Is this foolish of me?

(To be honest I've been EXHASUTED the last couple days and my husband thinks I could be pregnant..!!)