anyone else that was regular for af before getting pregnant ? and irregular after while breastfeeding.?? i was regular…

anyone else that was regular for af before getting pregnant ? and irregular after while breastfeeding.?? i was regular and then after having my daughter (she was born july 8th) i got af august 27th? suppose to expect my af tomwrrow? or was suppose to get by now ? i breastfeed . bt now switched my daughter to formula . had unproteced sex sept.16th... supposebly ovulated the 11th of sept... idk. im lost help anyone ? t.i.a