Norethisterone. Norethindrone (norethisterone) is a prescription medicine that can delay the start of a period. Your doctor my prescribe you three tablets a day, starting three to four days before you expect your period to begin. Once you stop taking the medicine, your period should begin within two to three days.
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It is not possible to postpone your periods. If you are worried about them, you should keep a count of your periods on a calendar.
7The periodic table has 7 periods and 18 groups.
Yes, it is perfectly normal to have irregular periods at first. Most girls worry about it at first, but there is no need.
No
Yes, You could get pregnant whether you have regular periods or not. But, If you have your period and you get pregnant it could lead to a miscarriage.
The change of inherited characteristics of species over long periods of time is called evolution.