Sex makes my period late????

So me and my boyfriend have decided that when we have sex close to when I'm supposed to be getting my period it makes it late. For example if I was due get my period today and we had sex yesterday I would get my period tomorrow. I know this sounds a little crazy but i think we're right. my period has been a week late. We

had sex everyday for the past week an a half, yesterday we didn't get time and I got my period today! Am I the only one this happens to!? Like WTF makes me so nervous! And input ladies? Is it just me?!