If you have had unprotected sex in the last 5 days or you think that your contraception may have failed, you may be able to have emergency contraception to prevent an unplanned pregnancy.
You can access emergency contraception from a number of services:
Luton Sexual Health check our opening times here
Walk In Centre
Some Pharmacies also offer emergency contraceptive pills, search on NHS Choices to find one near you http://www.nhs.uk/conditions/contraception-guide/pages/emergency-contraception.aspx