Now to prevent the obvious problem of "Why doesn't she get pregnant every few months" without being forced to make her exclusively lesbian or anti-vaginal-sex, I thought of her acquiring a magical item early that pauses her cycle, keeps it at the precise point, and "settings" of when the item is put on. So the types and ratios of hormones being released, and anything else in her reproductive system, stay fixed at that point.
My question is (and why it's here, and not in Fantasy
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I think that if it was put on at the height of fertility, when an egg had just been released, then no more eggs would be released after that one, as no new signal would be sent, that last egg could still be fertilised but with the uterus not moving on, then the pregnancy would miscarry early. The woman wouldn't menstruate, and the uterus would stay fully lined (for as long as the talisman is worn). As I recall, women are more sexually interested in this time, and according to my wife also more aggressive, so those effects I guess would stay. My wife believes that testosterone is released during this time - what effect would that have long term on her appearance?
Or the horror option, it's applied while she has PMS.
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Would the psychological effects be a permanent feature, or would the fact that the hormones are no longer shifting mean that they would settle?