The progestogen-only pill - NHS
www.nhs.uk › conditions › contraceptionThe progestogen-only pill-Your contraception guide. The progestogen-only pill. The traditional progestogen-only pill (POP) prevents pregnancy by thickening the mucus in the cervix to stop sperm reaching an egg. The desogestrel progestogen-only pill can also stop ovulation. The progestogen-only pill needs to be taken every day to work.