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You might be pregnant, under a lot of stress, or not have enough body fat.
you may not have enough of the hormone in your body try waiting a while
They might not have enough sleep
A woman's ability to become pregnant is not dependent on her age. It is a question of whether the woman's body is able and far enough developed to become pregnant. Typically the availability to become pregnant is tied closely to the beginning of a woman's menstrual cycle which typically does not happen until puberty (generally between the age of 12 - 14).
Not enough to be noticeable.
Either they are not getting enough food or they are stressed out.
Practically speaking, there isn't one. If you know EXACTLY where you're at in your menstrual cycle, there are days where the chance of getting pregnant is really, really small. But counting the days isn't accurate enough for that. One in five women relying on "safe periods" will get pregnant within one year anyhow.
Not enough to be significant, so just say no.
She may be stressed, or she may not have enough food or water to care for them.
If you have a bad heart, and are stressed out enough about it, that could happen.
it means you have not enough calcium lately
Unless it is stressed, the E has a short I sound (inuff).