It has been two weeks since my boyfriend and I have had unprotected sex and we use the withdrawal method (and I know that is not a good decision). I am now 8 days late for my period, last time it was 7 days. But recently, I just started college and I know that stress can induce late periods. My periods were typically on time before college and college is rather stressful. Is there a chance that my cycle is adjusting to this? Should I take a pregnancy test?