should i be worried

i tend to over think things and as of today my periods 2 days late. i am sexually active and my only form of birth control is condoms, i didn't have sex on my fertile window but for some reason my period is late. i did have a stressful last week due to classes and i happened to gain a weight, but i don't know if i should take that into consideration 😕

is there a time when is should consider taking a pregnancy test?