It is possible for your period to skip a month or two, but if you skip more than 4 months or so, you might be pregnant or there is something wrong with your horomones, or you might just be stressed...
It doesn't necessarily mean anything was wrong. Sometimes periods skip from stress or a bad diet (however, it would have to be a really bad diet, like having an eating disorder or losing a lot of...
Yes, lots of woman skip. Stress, weight, and diet are all factors of if your period come. It is only if you skip about 3 months that you should ask a doctor.