You must act quickly if you feel you are at risk and would benefit from PEP treatment. Do not wait all weekend to act and do try A&E if your local sexual health clinic is not open. Say clearly to the clinic or hospital staff that you have been exposed to HIV and want to use PEP. You will not be given PEP if you do not first have an HIV test. The hospital or clinic will do this for you. You will also have a test once the treatment is complete, to be sure it was successful.