HELP !!!

Hey guys so my period is now late by 13 days...and i’m confused. So april was the last time i had sex and i took a plan B afterwards and i got my period at the end of april, i didn’t get a period for may and now it’s june. I still haven’t had sex since april (with a male, i have a gf now) and both of my last cycle was extremely heavy and last almost a week which was not normal for me. could my cycle be still thrown off from the pill or could i be pregnant (even tho i have zero signs that i am) ? i just need some help i’m extremely confused.