Period late??

My period has been a little late from its due date for maybe these past two months, its been 4 days I still havent gotten it yet and I had sex last Wednesday and for like 5 seconds it was without a condom then i freaked out and made him put a condom on idk what to do or think im trying not to put the worst case scenario in my head

UPDATE: Thank jessuuuss I got my period I was so scared of actually being pregnant. Im only 18. I was scared cause my period was 8 or 7 days late and its never THAT late so i freaked. But im good now