Getting worried...

Period hasn't come. On cycle day 26, generally my cycles are only 24 days. I had unprotected sex 15 June, and my period came 2 days later. I had protected sex 30 June, twice both with condoms. All 3x that I have had sex, my boyfriend never ejaculated and we didn't have sex for ever, only for a few minutes. On June 30, there was a lot of blood again and he stopped and was like let's stop since you're bleeding, and we both just assumed it's probably cause we are doing it near to when my period is suppose to come. My period was suppose to come yesterday and it hasn't yet. I feel fine and I have felt fine. I have got some period symptoms hitting in, but I've also had so much stress ever since the 30 of June.. could stress definitely be a factor and that is why my period is late?