anyone past 6wks pp not have a period and not breastfeeding?

NINA • Mom of 4 baby #5 soon to come in Feb 2020

I'm 7wks going on 8wks pp and still no period I did breastfeed and formula feed at beginning for only first 2wks then just formula. I usually start my period b4 my 6wks checkup but this time i have not. I am just wondering if it going to come soon or not if I don't get one this month I would have no pd for 1 month...?!