Help!

I’m 6 days late and I’m never late 😣. I’m a virgin and for the past 2 years I’ve been regular but for the first time in a very long time I’m late and i have no clue why cuz I haven’t really changed anything in my diet, though I recently started doing some regular exercise. But even during the past 2 years i have tried working out though not regularly and I’ve never been late. What could be the reason?