Pregnant after loss

Raja

My last period date is 13/06, it was my postpartum period after losing my twins at 25 weeks i don't know if i am going to get my period this month or not, i used to have sore and tender boobs before period but this month i don't have this feeling and in my last pregnancy i got implantation bleeding but this time i didn't. Is it possible to get implantation bleeding in a pregnancy and not in the other?