period stress

My boyfriend left for bootcamp about a week ago and I've been crying every night and extremely stressed out. my period seems to be late by 1 day now (I didn't really track it last month but I'm pretty sure it's supposed to be here) we had sex maybe 3 days after the end of my period with a condom that did not break. I also just got a new job/started working out HARD. could these big changes be causing my period to be late? or has anyone experienced anything similar?