Everybody's different, but usually you would go through perimenopause first. This can last for several years and cause your periods to become irregular. But yes, I suppose you can just stop. You don't give your age - are you sure you're not pregnant? Because usually women know when they're getting close to menopause because their periods will be a little 'off' - light one month, heavy the next, or skipped altogether - they'll have hot flashes, things of this nature. You don't seem to be have any of this. There are other reasons why you haven't had a period, but if you are around 50 years old, then the beginning of menopause is a good bet.