By:
TATJANA MARKS
WHAT IS THE MENSTRUAL CYCLE?
The menstrual cycle is a monthly cycle
in which a woman’s uterus prepares for a fertilized egg to settle. The uterus
is also called the womb and is the part of a woman’s body in which babies grow.
Most women start experiencing their menstrual cycle between the ages of 10 and
15 until they are in their 40s or 50s. The menstrual cycle has four phases and
lasts around 28 days.
THE MENSTRUAL PHASE
The first phase is called the menstrual
phase and is usually called the period. The period is the part of the cycle
during which women experience blood flow out of their vagina. It usually lasts
about three to seven days. Day 1 of the menstrual cycle is therefore the first
day of bleeding a woman experiences during one of her cycles.
THE FOLLICULAR PHASE
The second phase is called the
follicular phase and is the part of the cycle during which the female body
prepares for pregnancy. The follicular phase includes the menstrual phase, so
for a 28-day cycle, it would last from day 1 to day 13. Women have eggs inside
their bodies which can grow into babies if they are fertilized by sperm. During
each cycle, one egg becomes ready to be fertilized.
THE OVULATION PHASE
The third phase is the ovulation phase.
This stage of the cycle is only around one day long and happens around halfway
through the cycle, so for a 28-day cycle, it would happen on day 14 (14 days
after the first blood flow). During this stage, the egg has finished being
prepared and is ready to be fertilized. Women are most likely to become
pregnant if they have sex before or during the ovulation phase. Sperm can
survive inside the female body for up to a week, so if a woman has sex a few
days before the egg is ready to be fertilized, the sperm can ‘wait’ inside her
body for this to happen.
Because the length of a menstrual cycle
varies between women, the time when they are most likely to become pregnant
also varies between them. If on average you have a period every 28 days, you
ovulate around day 14 and you have the highest chance of becoming pregnant if
you have sex between days 11 and 14. If you have a short cycle of around 24
days between two periods, ovulation happens around day 10 and you are most likely
to become pregnant if you have sex between days 7 and 10. If you have a longer
cycle of around 35 days, ovulation happens around day 21 and you are most
fertile between days 18 and 21. It is important to remember that these are just
probabilities. You are not guaranteed to become pregnant if you have sex during
these periods and you may also become pregnant if you have sex outside these
periods, it is just less likely.
THE LUTEAL PHASE
The final stage is called the luteal
phase. It lasts from day 15 to day 28. What happens during this stage depends
on whether the egg was fertilized by a sperm. If it was fertilized, the egg
moves into the uterus and eventually turns into a baby. If it was not fertilized,
the lining of the uterus is shed through the vaginal opening, the period
starts, and a new menstrual cycle begins.
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