Could The Delay In My Period Be Caused By Irregular Cycles Or Exercise?

I had unprotected sex on December 10th (he used the pull out method) and it was 2 days after my period and I was supposed to get my period on January 2nd and I haven’t gotten it yet (my periods are usually irregular- my hormones aren’t balanced) and I’ve been working out 3 days a week since the end of December