period is 3 days late, pregnant?

hi

my period is 3 days late

for the past couple of months, my period has been irregular as i have had to take the morning after pill. 

my last period was induced my the morning after pill. since then, i have had sex a couple of times with my boyfriend PROTECTED BY CONDOMS and im almost 100% sure the condoms havent broken and i check every time afterwards. 

i have sore breast and they look bigger but this happens normally when i PMS

i also have cravings and cramps but this also normally happens when i PMS 

i have been travelling a lot lately and am moving houses and country's as we speak, so maybe this may be influencing it, im not sure?

i have also changed my diet from vegan (no dairy), to vegetarian (dairy). 

what do you think is wrong?

do you think i should take a pregnancy test?

any responses are helpful!!

thank you!!