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Each month inside your ovaries, your eggs, in small, fluid-filled sacs called follicles, begin to grow. Eventually, one of the eggs is released from the follicle. This is called ovulation, which usually occurs around 2 weeks before your next menses.
After the egg leaves the fluid-filled sac, hormones begin to rise and the sac develops into something called the corpus luteum. The corpus luteum tells the uterus to prepare for the egg, and the thickening of the uterus lining begins.
Once the egg has been released, it travels down the Fallopian tubes, waiting for a single sperm to fertilise it. The egg waits in the tube for around 24 hours.
A single sperm meets the egg and fertilises it and in that instant, your baby’s genes and sex are set.
The egg stays in the tube for 4 to 5 days, dividing into many cells. This process continues as the egg travels down the Fallopian tube until it reaches the lining of the uterus. Here the egg will attach itself, this is called implantation.
Within 3 weeks, your baby’s first nerve cells have already formed.
around 72-96 hours after implantation has occurred, there should be enough of the hCG hormone in your system for a pregnancy test to show as positive.