could i be pregnant

okay so i’m on the pill and i missed a few days and then my ex bf went to have sex with me and decided not to use the condom but only went in 1/4 the way and then just to be safe i got the plan b and took it 20 mins after everything happened jut bc of pre cum and everything. i’m supposed to get my period tomorrow feb 25 but i’m scared it won’t come. could i be pregnant?! (My birth control also is supposed to regulate my periods)