late period, stress?

my period is late by 2/3 days. i have had unprotected sex in the last month but he has effectively pulled out or stopped to put a condom on any time he doesn't wear a condom. i have been pretty normal, although i guess i have come early/late in the past. i am not sick, haven't gained or lost a lot of weight or gotten more excercise and wasn't stressed about the possibility of being pregnant until now, and before that i don't know if i was really that stressed if that can be a reason to be late. i haven't had any symptoms besides being super bloated, which i thought was because of drinking soda and general diet/pre period. is it possible i'm pregnant? should i take a test? i do not plan on having a baby for numerous reasons.