Amenorrhea is the absence of periods (menstrual bleeding) for more than 6 months. Absence of periods during 2-6 months called oligomenorrhea. Amenorrhea could be primary or secondary. You can discover everything about amenorrhea causes in recommended related link below.
You're pregnant
If its your first period, then you dont really know if there's anything really wrong with you. But if your period came once and hasn't come for more than a month and a half, then there might be something wrong. But dont get scared. Usually periods come around every 4 weeks. :) It's basically natural.
A menstrual period typically occurs once a month, although the cycle length can vary from woman to woman. Each menstrual cycle lasts around 21 to 35 days, with bleeding usually lasting around 2 to 7 days.
if you mean when a girl has her period, this happens once a month once the girl reaches puberty.
"Fortnight" is a term that means a period of two weeks. So, "every fortnight" means something that occurs or happens once every two weeks.
It is something that occurs once in two time units.
dogs are actually infertile and dont get there period until after relations
You mean 'once in a minute, twice in a moment. but not once in a thousand years. Answer is the letter 'm'
I am not sure what you mean by cancel out a pregnancy. The only way to stop a pregnancy once it occurs is abortion. Sometimes you can induce a period before pregnancy occurs to prevent it. The pills have instructions that say exactly how many you can miss.
You may have... cancer? Concult a doctor.
If it occurs once, it's a normal variance. If it occurs four month in a row, see a doctor.
once a week. tried it myself. period. dont try it u crazy kids