Getting pregnant (conception) happens when a man’s sperm fertilises a woman’s egg. For some women this happens quickly, but for others it can take longer. Out of every 100 couples trying for a baby, 80 to 90 will get pregnant within 1 year. The rest will take longer, or may need help to conceive. To understand conception and pregnancy, it helps to know about the male and female sexual organs, and to understand how a woman’s monthly menstrual cycle and periods work.
The menstrual cycle is counted from the first day of a woman’s period (day 1). Some time after her period she will ovulate, and then around 12-16 days after this she’ll have her next period. The average cycle takes 28 days, but shorter or longer cycles are normal.