Sperm and egg not develping

Ovulation is a part of your menstrual cycle. It occurs when an egg is released from your ovary. When the egg is released, it may or may not be fertilized by sperm. If fertilized, the egg may travel to the uterus and implant to develop into a pregnancy. If left unfertilized, the egg disintegrates and the uterine lining is shed during your period.
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Why don't all eggs fertilise in the IVF lab?

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6 Surprising Facts About the Female Egg Everyone Should Know

People have sex for pleasure, reproduction, or both. Pregnancy happens when an egg and sperm successfully meet through intercourse or in vitro fertilization. What do they look like, and how many do we all have? The first thing to know: both eggs and sperm are gametes. A gamete is a sex cell that contains half of the genetic material haploid as a normal body cell.
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6 Surprising Facts About the Female Egg Everyone Should Know

But although millions of babies have now been born by IVF , the technique can offer no help to couples eager to have a child that is genetically theirs but who lack the eggs or sperm to make it: men whose testes produce no sperm, say, or women who have undergone surgery for ovarian cancer. Some opt for donor eggs or sperm, but an alternative may be on the way. Scientists are making steady progress towards creating human eggs and sperm — the so-called gametes that combine in fertilisation — artificially in a petri dish. The feasibility of such an extraordinary transformation of our flesh has only been recognised for 11 years. But already it is revolutionising medicine and assisted reproductive technologies may eventually feel the benefits too.
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Back to Infertility. Some problems stop an egg being released at all, while others prevent an egg being released during some cycles but not others. When you're ovulating, mucus in your cervix becomes thinner so sperm can swim through it more easily.
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