Mirena removal iud and no period.....

I need help to understand this i had my mirena iuf taken out on march 11th i had bleed for a couple of days and i haven't seen a period yet but i had unprotected sex two weeks ago but up i also breastfeed my daughter but i had also taken two pregnancy test and they came back negative so how does it take to get a period back again??? Has anyone ever gone through with this type of thing *mind you i still didn't get a period before having it remove