The fact that the fever has not returned after 72 hours of antibiotics is a good sign. However, a painful swelling on the palate that feels like pus has collected should not be assumed to disappear with antibiotics alone. The infection may still need to drain properly and the source of the infection needs to be treated.
Next Steps
Please contact your dentist for a review as soon as possible, especially since the swelling is still very painful and is not draining. The dentist can check whether there is a collection of pus and whether further drainage or treatment of the affected tooth is needed.
Continue the prescribed antibiotics for the full course unless your dentist tells you otherwise. Do not try to puncture, squeeze or drain the swelling yourself.
Health Tips
You can continue gentle warm salt-water rinses a few times a day, but do not rinse aggressively or press on the swelling. Keep the area clean and stay well hydrated.
After successful treatment, pain and swelling should gradually improve over the following few days, although complete healing can take longer. Since you still have a painful swelling after 72 hours, it is better to have it checked rather than simply waiting for it to disappear.
Seek urgent/emergency care if fever returns or you develop rapidly increasing facial/neck swelling, difficulty swallowing or breathing, difficulty opening your mouth, or feel very unwell.