Tracking your cycle can help with fertility. To give you the best chance of getting pregnant, our ovulation calculator tells you when you're most likely to be fertile. Enter the first day of your last period and how long your cycle usually lasts (between 20 and 45 days). We'll show you the best days to have sex that could lead to pregnancy – so you can mark your calendar.

Most couples get pregnant within three months. If you try for a year without success (or six months if you're 35 or older), seek help from a fertility specialist.