Yes, there is a 21 day menstrual cycle. The typical cycle is 28 days but everyone is different and some people may have shorter menstrual cycles than this.
The typical menstrual cycle is around 28 days in length, but this varies from person to person so it can be longer or shorter. It's also normal for there to be up to a weeks variation from the average menstrual cycle.
Yes, it is possible for a menstrual cycle to last for only 2 days. Menstrual cycles can vary in length and intensity from person to person, and some individuals may have shorter or irregular cycles. If you are concerned about the length of your menstrual cycle, it is recommended to speak with a healthcare provider for further evaluation.
With advancing age does come shorter menstrual cycles, and furthermore menopause, but that is not the only reason why a woman can have a shorter cycle. There are studies that show that high caffeine intake shortens menstrual cycles. Shorter menstrual cycle indicates a less of a chance of getting pregnant.
Various things can happen to cause bleeding outside of the menstrual cycle. For example, it is possible for sex to cause bleeding.
The typical menstrual cycle is 28 days, but everyone's cycles are different. A 20 day menstrual cycle is on the short side so if this is a regular thing or gets shorter then see your doctor, but otherwise don't worry.
There is no cause.
No, it isn't bad to have your menstrual cycle longer than 4 days. The term menstrual cycle means the reproductive cycle, which is typically 28 days long. If you mean menstruation then this is normally between 5-7 days long but a little shorter is fine too.
some birth control pills give you a shorter period.
Becoming sexually active does not generally change your menstrual cycle. If you are using contraception, such as the birth control pill, coil or Depo Provera injection, then your menstrual cycle can change. Your periods may stop or they could become shorter and lighter in flow.
No, a urinary tract infection will not cause menstruation to stop. Menstruation is controlled by your menstrual cycle and the hormones related to your reproductive organs. A urinary tract infection has absolutely nothing to do with your reproductive organs or menstrual cycle.
Four B12 shots usually will not cause your menstrual cycle to be late. Your cycle can be late if your body is low in vitamin B12. You should talk with your doctor and ask him why your menstrual cycle would be late