It means you need to visit your gynaecologist, could be either you are having some hormone imbalance or something else.
a womans period should come at an average of every 28 days
Not at all.
Yes, a womans cycle is calculated from the first day of her period
you will most likely be getting your period.
Yes, it is a bad thing when your period doesn't come bacj for a long time. MEnstruation is one of the best indicators of a womans overall health, you will only ovulate on a regular basis if you are healthy, thus not ovulating regularly may be an indicator of a health problem. If you go for longer than three months without your period you should talk to your doctor.
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.
Menopause
Roughly once a month, hence why it is called a 'monthly period/cycle'
A woman's period is what happens when a females uterus has one or occasionally two eggs that is not fertilized by a male in a certain amount of time. The egg must come out, so the egg comes out with a bit of blood. How you get it fertilized by a male is through sex.
The first day of a womans menstrual period is just that - the first day of menstruation.
If your a man you should be buying a truck
The term should read women's rights.