Need some help

So 2 weeks ago I had unprotected sex with my boyfriends who did not cum inside me but he did have some pre cum, the next day it happened again same situation. Now I'm 4 days late on my period. I'm a little comfused because my cycle day is 27 days and in eve it's only been 24 and it said I should be on my period.. I need some answers, could I be pregnant ? Could me stressing about it delay my period ? I need some answers