If you're planning to get pregnant, it's time to start
identifying the ovulation day in your cycle. Your chances of
getting pregnant are much higher if you make sure that you have sex
in the days leading up to that critical ovulation day, so
identifying that particular moment is pretty important.
Unfortunately, by the time you know it is an ovulation day -
it's often too late. In as little as twelve hours, the egg will
leave the body unless it has been successfully fertilised.
What happens on ovulation days?
Ovulation days are a critical point in the menstrual cycle. The
timing of ovulation is controlled by hormones. After menstruation,
in the days leading up to ovulation, oestrogen levels start to
rise, and in response the uterine lining thickens and cervical
mucus becomes thinner and more receptive to sperm.
At a certain level, oestrogen triggers the release of the
gonadotrophin hormones which collectively cause ovulation to occur
- and an egg to be released into the fallopian tube.
The combined effects of these hormones include an increase in
sexual desire in women before ovulation and a rise in resting body
temperature shortly after ovulation.
The egg lives for around 12 to 24 hours and unless it meets a
sperm in the fallopian tube, it will leave the body.
How can you identify the most likely ovulation day in your
cycle?
The stock-standard response is that ovulation occurs on Day 14
of your cycle (with Day 1 being the first day of menstruation).
This assumes that you have a 28 day cycle; but most women vary
somewhat from the 'average' cycle. It can be very hard to identify
ovulation days without having a clear understanding of your cycle,
so if you can, try to chart your menstrual cycle for a few months
to try to identify a pattern.
There are a number of ways that you can chart your cycle. The
most effective methods combine the possible symptoms of ovulation,
the tracking of your basal (at rest) body temperature and the
composition of cervical mucus.
You should see a pattern after a couple of months, although
ovulation does not always run to plan and can be affected by such
factors as stress, illness, physical activity and changes in
diet.
Why many contraceptives prevent you from identifying ovulation
days
There's no point trying to chart your menstrual cycle if you are
taking birth control pills, or any other form of contraception that
involves the release of synthetic hormones into your body - you
will not be able to identify the ovulation day in this case.
This is because the action of these synthetic hormones will
override your body's usual hormonal rhythm and while you are taking
these drugs, your body will not usually ovulate.
The main contraceptives that affect your body's usual cycle of
ovulation through the use of synthetic hormones are all
contraceptive pills, any injected contraception - for example, Depo
Provera, to implants that slowly release hormones from underneath
your skin, and to vaginal rings which release hormones.
'Mechanical' contraceptives (such as condoms or non-hormone
laced IUDs or diaphragms) can still be used safely while you track
your body's usual ovulation cycle.
Why is it important to predict the ovulation day?
Planning is everything! Your body's most fertile period starts
around five days before ovulation, and ends just 12 to 48 hours
after ovulation.
This is because sperm can live in your body for four to five
days after ejaculation, while the egg lives for between 12 and 48
hours after release.
If you have a good idea of your usual cycle and can interpret
the various signs and symptoms your body usually exhibits before
ovulation, you can make sure you have intercourse during your most
fertile period, thus maximising your chances of getting
pregnant.
Now I know my likely ovulation day - when is the best time to
have sex?
For all the science around fertility and conception, and all the
research around identifying what happens when in ovulation days,
there is still an enormous amount that we don't really know.
Most general expert advice is just that - very general, and
every woman's body will be different.
Because so many factors affect ovulation - and because it's hard
to identify the most likely ovulation day until it's almost too
late - the most effective strategy is to have sex regularly at
least every two days throughout your cycle.
Your chances of falling pregnant are much greater if you have
sex before the ovulation day rather than at ovulation or later,
because by the time the sperm swim to the egg, you may have missed
your 'window.'
By Fran Molloy, journalist and mum of four