You no longer need to take a self-test if you have complaints that are consistent with the coronavirus. It's allowed. Whether you test positive or negative, it remains important that you follow het advices closely and do not transmit a possible respiratory infection (such as corona, flu or a cold) to you protect people with vulnerable health.
Stick to the general advice if you have symptoms consistent with a respiratory infection:
Are you ill? Stay at home.
Are you not ill, but do you have symptoms? Work from home if possible. Consult with your employer if necessary.
Cough and sneeze into your elbow.
Keep your distance from others.
Avoid contact with people who could become seriously ill from a respiratory infection.
Is contact still necessary (for example for informal care)? Wear a mouth-nose mask.
Good hygiene helps to limit the spread and can help prevent you from becoming ill yourself. Therefore, wash your hands often and thoroughly with soap and water and ventilate indoor areas.