[Calaer]

If you two haven't actually had sex, then no. She cannot be pregnant. Periods are finicky things. The cycle can be disrupted by something as simple as a change in diet, low blood sugar, ect. It's very common and normal for a girl to miss her cycle one or twice. It could even be caused by an increase in stress. I wouldn't sweat it, but if it makes you feel any better, you could always take test to help put your mind at ease. I hope this helps!