If the months are drifting by without a sign that you've made that longed-for baby, you may begin to wonder if there's a problem.

Try not to be anxious. The time it takes to conceive varies a great deal. Even if all is well, you have only a 20 per cent to 25 per cent chance of getting pregnant each month.

That said, your age does make a difference. If you and your partner are in your early 20s, you should expect success within about five months. If you're over 35, keep trying, but see your see your GP sooner rather than later if you think you may need help to conceive.

Getting pregnant is not entirely down to luck. Try to have sex every two or three days and learn to spot the signs that you're in your fertile window.

If you feel you've already taken all the advice and done the waiting, see your doctor. Infertility affects about 15 per cent of couples at some point. But even if you turn out to be one of these couples, it doesn't mean you will never have a baby. You may just need more time or medical help to conceive.