after sex with my bf this month;he came on the bed but i still used postinor2 as directed inthe leaflet,i felt pains for a couple of hrs & that was it;no bleeding,nothing. We foreplayed intensely sometime later close to my due date for my period;18th-21st

My fear is I haven't seen my period yet now 27th & the only abnormal feeling/sign in my body is that my breasts have grown bigger(I get this too before my period,but this has lasted more than a week since I was expecting my period). How long do i have to wait before i see my period again? Pls could I be pregnant? I don't want to be...