Possible pregnancy?

I am 18 years old. My boyfriend and I have never had "actual" sex. (vaginal penetration) we have attempted anal on many occasions. My boyfriend never finishes inside me when we do this, he has pulled out every time and most the time makes himself finish. So everytime I see it happen and am no where near it. He also rarely has per-cum, ive only seen it about once or twice during hand jobs and its barely a few drops. He says he doesnt even do it when he masturbates on his own. He also takes a very long time to finish, we've been dating over a year and I've only ever been able to make him finish (hand job) 3 times. And even when he does it himself it takes a pretty long time. Another time we were messing around and he was jacking himself off while I just kissed him, Both our clothes were on and he finished. He went to finger me and before doing so I made sure all his fingers were dry even though he told me he hadn't even used that hand while jacking off. I have a pretty strict schedule with my period, about every 28 days. Sometimes the day before, the day of, or the day after. My period is now three days late and I'm terrified. It was supposed to start Friday and it is now Monday. I was super stressed on Thursday and Friday and had a pretty big sports game happen on Saturday. On top of those things I've been really stressed that my period has not come yet. I've barely eaten since Saturday and can not focus on anything else. I don't think I've wanted my period any more than I do now. I don't have any pregnancy symptoms or Pms symptoms. Could I be pregnant?