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chendexin木虫 (正式写手)
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Good Fertility Guide
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Timing: How to work out when So you’ve decided you want a baby. You’re going to have some unprotected sex. Nature does the rest, right? Wrong. The secret is in the timing. You’ve got to get those sperm in the right place for those vital 24 hours between the egg being released from the ovary into the Fallopian tube and it beginning to degenerate. To get it right, there’s nothing like a lot of sex at the time of ovulation, or more importantly, from four to five days before, since sperm can survive in a woman’s cervix for days if they get there at the right time. But couples aren’t always good at doing this. The fertility expert Lesley Regan saw a married couple, both barristers, who were concerned that they had a fertility problem. How often did they have sex, she asked. “Once a month,” they replied. Knowing when you are most fertile is the key and that means working out when you ovulate (release an egg) to find out the best time to have sex. You ovulate about 14 days before your next period starts; simple if you always know when your period starts because you can work backwards. But you don’t. A 28-day cycle (with the first day of the period day one and ovulation on day 14) may be the norm, but real women aren’t Mrs Norm, and it’s near impossible to work out ovulation by counting days. OVULATION TEST KITS These help you to identify when ovulation is about to happen by measuring chemicals in the urine. VAGINAL SECRETIONS “Research increasingly indicates that women are fertile four to five days before predictor kits indicate anything,” says Jane Knight, a fertility researcher at the University of Oxford. “It is far better for couples to be guided by changes in vaginal secretions. These usually start off sticky white, but when it becomes wetter, transparent and stretchy, it indicates when a woman is most fertile and receptive to sperm.” The mucus forms little liquid channels which help the sperm to swim upwards. It may appear several days before ovulation, but sperm can survive in it. Once the fertile time has ended, the mucus thickens or disappears. “If a woman is feeling dry, there’s virtually no chance of her becoming pregnant,” says Knight. TEMPERATURE Women who are really serious about getting pregnant might want to monitor their temperature. According to Knight, women can be taught to record their waking temperatures accurately. An abrupt temperature rise of 0.2C occurs just after ovulation — and remains high until the next period. |
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