You cannot catch COVID-19 from the vaccine. But it is possible to catch COVID-19 and not realise you have the symptoms until after your vaccination.
The most important symptoms of COVID-19 are recent onset of any of the following:
• a new continuous cough
• a high temperature
• a loss of, or change in, your normal sense of taste or smell
If you have any of these symptoms, stay at home and arrange to have a test.