Marvelon is a combined oral contraceptive pill (‘the Pill’). You take it to prevent pregnancy. This low-dose contraceptive contains two types of female sex hormones, oestrogen and progestogen. These hormones prevent an egg being released from your ovaries so you can’t get pregnant. Marvelon also makes the fluid (mucus) in your cervix thicker which makes it more difficult for sperm to enter the womb. Marvelon is a 21-day pill–you take one each day for 21 days, followed by 7 days when you take no pills.