There's no baby yet, but your body is getting ready by preparing for ovulation. At around day five of your menstrual cycle – this is five days after your period started – an egg (ovum) starts to mature inside a fluid-filled sac (follicle) in one of your two ovaries. The lining of your womb will also start to thicken in preparation for the implanting of the egg.
The date of the first day of your last period is important because your pregnancy will be calculated from this date, even though conception doesn’t usually take place until around two weeks later. This means that although pregnancy is described as 40 weeks, you won't actually have conceived until around the end of the second week. Emma's Diary Due Date calculator will help you work out when your baby is due.
Things for you to consider during week 1 of your pregnancy:
What to expect at week 2 of your pregnancy...