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Conception is a lot more complicated than the act of
joining the sperm with an egg. The timing and conditions must be
right to ensure that it is successful. People naturally assume that
conception will take place soon after they stop taking ‘the
pill?- it is a presumed natural and straightforward event. Each time a
man ejaculates,
he produces sperm. However, for women it is usually only once that she will be ready to
conceive in the month. Usually a fortnight before the first day of your period, you will
produce a single egg from your ovaries. The egg swims to the fallopian tubes and lives
there for approximately 12 hours. If it is not fertilized at this time, it dies and is
absorbed back into the cells of the tube and the cycle starts again.
If you have sexual
intercourse around the time you ovulate there is a big chance of conception taking place.
Once ejaculation has occurred, the sperm (there could be up to 1000 million of them)
separate from the seminal fluid and move up towards the cervix. The strong sperm survive
this journey and the weaker ones die.
The vagina is quite an acid
environment for the sperm and it takes resilient ones to withstand it. By the time the
sperm reach the fallopian tubes, there are only two thousand left. The sperm struggle and
fight to be the one to fertilize the egg when it is released. The one that connects with
the egg is the fittest and strongest and this is natures way of ensuring that unhealthy or
damaged sperm are not able to fertilize an egg.
Fertilization
occurs when a
sperm penetrates the outer surface of the egg. Once the egg is fertilized, the tail drops
off and the rest of the sperm die. The egg and sperm each with there own genetic
information now combine together and form a single nucleus.
All this genetic
information will determine the sex and characteristics of your child. The nucleus divides
into two and over the next 3 days will continue to divide until there are 64 cells.
As this is happening, the
egg travels through the fallopian tube towards the uterus. After the seventh day, the egg
is able to snuggle into the lining of the uterus - now it can be nurtured and a pregnancy
can start.
Once this happens
conception is complete. The egg can be nourished by the blood supply in the uterine
lining. At this time the ovary is informed that fertilization has occurred and it stops
ovulation and the body also ceases menstruation.
Twins
Occasionally however,
the egg divides into separate halves, instead of doubling the cells in a single cell. The
two separate embryos will be identical twins as they started off from the same egg and
sperm. Non-identical twins will occur when two egg cells are released at ovulation and are
fertilized by two different sperm.
Most couples find it
reasonably easy to conceive, however sometimes it may take up to two years or so before it
occurs. Other couples have great difficulties in conceiving and the problem can be with
either partners or both.
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