For reasons I’d prefer to keep private, I would like to know how a woman can induce menstruation, especially after more than 28 days have passed since her last period. The person I have in mind has always had erratic, sparse and inconvenient periods, and would like to know how to bring the next one on before mid-February. Can it be done?
Tell her to see a gyno.
Theres usually a reason why it’s so sparse and erratic.
That and the gyno’d be able to tell her how to get a regular cycle again.
Extreme nervousness or anxiety often triggers an early period. In fact, Van de Veld’s The Ideal Marriage, a sex manual published before even I was born, cautions against scheduling a wedding in the two weeks before an expected period. Many a honeymoon, he says, has been spoiled by an early period.
How do I know this? Mom had a copy, and I read it, as a breathless teenager.
Or a late one.
If the woman in question is sure she’s not pregnant, menstruation can be regulated by the use of birth control pills or other types of hormonal contraceptives. She’d obviously need to see a doctor in order to get a prescription and competent instructions about how to regulate her periods. If she’s unwilling or unable to take hormonal contraceptives, many people claim that various types of herbs can induce menstruation, but I haven’t seen any reliable evidence that these “natural” remedies work, and I’d be concerned about the safety of some of them. A good gynecologist should be willing and able to discuss the pros and cons of alternative medicine treatments as well.
Some other things affecting can be diet (one of my classmates went from very erratic, painful menses to regular and less painful ones when she started eating at the school, which made all of us wonder what the heck did her mother cook), or the time of year (for 15 years I was “on the clock” except in March, where I’d be late, and September, when I was early).
There’s tons of factors, but basically,
[ul]
[li]there is no way menses can be “programmed”, the best you can do is get them regular, you can’t say “ok, this month I want it on the 3rd and next month on the 15th”[/li][li]see a gynecologist[/li][/ul]
Am I the only one who’s thought of those women who, after 15 or 20 years on the pill, want to get pregnant on the same month they stop taking it, “because I want my baby to be born in X period so blahblah vacation school blahblah”? It’s not that easy, sorry 
Billions of women have wished it was.