Nearly a third of women describe their average working week as chaotic and changeable - a situation that could lead many to forget their daily contraception
Research by Bayer Schering Pharma found that only 19 per cent of women follow the same work routine every day.
The company believes that this may explain why 84 per cent of women who use daily contraception have forgotten to take it on at least one occasion.
Spokeswoman Dr Sarah Jarvis commented: "A chaotic routine has a big impact on a woman's life but by no means should it leave her feeling anxious and at risk of an unplanned pregnancy."
Dr Jarvis explained that long acting reversible contraception (Larc), such as the intrauterine system (IUS), injection and implant, can remove the hassle of daily contraceptive pills.
She revealed that these are all effective at preventing unplanned pregnancy and can last for between three months and ten years, depending on the method chosen.
A recent report in the Sunday Telegraph revealed that the government has written to many council and health chiefs asking them to encourage the use of Larc methods, particularly among teenagers.