Should I still be concerned?

My boyfriend and I have only had sex without a condom once, and he was nowhere near close to ejaculating inside of me, but I know you till need to be worried about pre-***. He also wears compression shorts everyday, so I know the likely hood of being pregnant is lessened, but I still am worried. I have recently taken a home pregnancy test(first Response Early response) and it turned out negative. I have been having a few early pregnancy symptoms, but none that aren't exactly like PMS, my period is a week late today. But for my past five periods they have also been a week late. Also, around this time of year last year, my period was twenty days late and I was just as concerned then. Do you think the schedule and temperature change could be the result of my missed period. Is there any possible way I tested to early? Should I retest again? Please give advice.