An STI test is the only way to be certain that you do not have an STI or HIV. A standard STI test checks for chlamydia, gonorrhoea and syphilis. Vaccination against hepatitis B is discussed. A standard STI test is done on people with a high risk. If there are clear symptoms, a test can focus on a specific STI.
You can find the nearest municipal STI clinic using the clinic locator
If you have symptoms, go to a doctor immediately
Are you worried after having unprotected sex or because a condom got torn, but you do not have symptoms (yet)? Two weeks later, an STI test can show whether you have an STI.
If you have no symptoms, an HIV test is only advisable three months after unprotected sex. It can take three months before your body starts producing antibodies. Only then can an HIV test show whether you are seropositive.