Stressing too much

I just got the <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> app and I have put down the needed information to predict when my next period is due but <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> had predicted the 22nd of Jan and it's now the 26th and I still haven't got my period.

I'm not in a relationship of any sort. And I'm a virgin but i can't help being anxious

The thing is before I wouldn't monitor when my period is due. So I'm not sure how far apart my periods dates are...

Please help!!!😫😫