Why haven't I had my period this month?

why did I get my peried last mounth but for 3day why? I'm a virgin

Periods can be late for a LOT of reasons, and if your periods are usually within a couple days of each other, than you really are very regular normally. Same goes for them being longer or shorter. If that's as off as you've been before, this may be the one time you have NOT been regular, but now and then, some irregularity -- even to the degree of skipping a period entirely now and then -- is both common and normal.

That can happen for any number of reasons: a hormonal shift, a change in diet, body weight or activity, due to stress (or more accurately, how we tend to change our behavior and lifestyle when we're stressed), as well as due to other physical or medical conditions.

The golden rule, when you know you're not pregnant, is to not sweat cycle weirdness until it's gone on for two or three cycles. So, for sure, ask your gynecologist when you see him or her if you're still late, but they'll likely tell you, given you're not pregnant, not to worry about it for now, and to just keep an eye out.

xox
Sika