As helpful as COVID vaccines currently are, they do not work as anti-COVID drugs and the newer variants of concerns that spread may also lower the efficacy rates of the vaccines. So, there is very much a possibility that you can catch coronavirus, after being vaccinated, and hence, no complacencies should be entertained.
Can COVID-19 vaccines reduce long COVID symptoms?
However, do remember that these infections, or breakthrough cases, as they are called, are still rarer in numbers. So, even if there is a real risk of the virus causing infections, the risk is on the lower side. As data as suggested, different vaccines carry a different risk of breakthrough infections and symptomatic risks.