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Solutions to infertility: getting your timing right SOLUTIONS TO INFERTILITY: GETTING YOUR TIMING RIGHT
The bottom part of the womb, the cervix, changes quite dramatically during the menstrual cycle according to the hormones being produced. Understanding and recognizing these changes is one of the most important ways you can pinpoint the best time to have intercourse in order to conceive.
The mucus-secreting glands (crypts) which line the cervical canal produce mucus continuously but this fluid undergoes important changes during the menstrual cycle. During the first half of the cycle (the follicular phase), the mucus is thick and sticky. It forms a plug over the cervix, which stops semen entering. It also makes the vagina acid, which can kill off sperm within a few hours.
About three to four days before ovulation, as oestrogen levels increase, the mucus becomes clear and stretchy and the amount increases. Surrounded by this fertile mucus, sperm can live for up to seven days.
So it is possible to have intercourse on a Monday and actually conceive on a Friday! This fertile mucus turns the vaginal fluids alkaline, keeping sperm alive. It also provides nourishment for the sperm, in the form of increased amounts of sugar, amino acids, salt and water.
The other intriguing aspect of this fertile mucus is that it forms 'swimming lanes' (or canals) through which the sperm can pass quickly. It also seems to act as a filter, allowing the healthy sperm to travel forward but effectively trapping the abnormal sperm (there are always some abnormal sperm in semen) and blocking their passage. Once ovulation has taken place and progesterone increases, the mucus again becomes thick and sticky (infertile mucus), protecting the cervix from sperm and also from any foreign bodies.
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