What happens if fertilisation does not occur

Within 24 to 36 hours of an LH surge, a mature egg will be released or ovulated for fertilization. An egg is available for fertilization for 12 to 24 hours after ovulation. It will disappear after 24 hours if it is not fertilized.

On the other hand, sperm can live in the body for 3 to 5 days, making the total fertile window for most women around 5 to 7 days. This means you can get pregnant from intercourse that occurred either just before or just after ovulation.

If the egg is not fertilized, the lining of the uterus, which has thickened to prepare for fertilization, sheds through menstruation. The first day of heavy flow marks the first day of your next cycle, and the process begins again.

Once fertilization takes place, this newly fertilized cell is called a zygote. From here, the zygote will move down the fallopian tube and into the uterus.

The zygote then burrows into the uterus lining. This is called implantation. An exception to this rule would happen with in vitro fertilization IVF. In this case, eggs are fertilized in a lab. Ovulation is when a mature egg is released from one of your ovaries. There are a number of reasons why fertilization might not happen. This includes use of contraception and infertility. Usually, only one egg is released during ovulation. However, the ovaries sometimes release two eggs at once.

In this case, you might become pregnant with twins. These twins will be known as fraternal twins also called nonidentical twins. Fertility treatments like IVF can increase the likelihood of multiple births , according to Cleveland Clinic. This is because fertility treatments often involve transferring more than one embryo to the uterus at a time to increase the chances of pregnancy.

Fertility drugs can also result in more than one egg being released during ovulation. Because both cells come from the exact same egg cell and sperm cell, identical twins will have the same DNA, the same sex, and a nearly identical appearance. At the point of ovulation, the uterus wall is thick. The menstrual cycle The female reproductive system includes a cycle of events called the menstrual cycle.

These are the main features of the menstrual cycle: The start of the cycle, day 1, is when bleeding from the vagina begins. This is caused by the loss of the lining of the uterus, with a little blood.

This is called menstruation or having a period. By the end of about day 5, the loss of blood stops. If the egg is fertilized by a sperm as it travels down the fallopian tube, then pregnancy occurs. The fertilized egg attaches to the lining of the uterus. The placenta then develops. The placenta transfers nutrition and oxygen to the fetus from mother. If the egg doesn't become fertilized, the lining of the uterus endometrium is shed during menstruation.

The average menstrual cycle lasts 28 days. The cycle starts with the first day of one period and ends with the first day of the next period.