My in-laws received their first dose of vaccine last month. As luck would have it, father in-law was infected by COVID by someone with who he worked, then gave it to my mother in-law. They both were infected by COVID no more than a week following their first vaccination dose.
FIL had symptoms like a bad flu; aches & pains, fatigue, cough. MIL had less-severe symptoms, though with everything in the news, she was imagining the worst.
I presume that the first vaccination did not yet produce the full amount of antibodies, but it may have helped some. Regardless, they have both been instructed to NOT pursue the second dose of the vaccine for another six weeks.
Speaking of therapeutics, there are some very promising antibody treatments that have received EUA as well. If the vaccine doesn't keep you from becoming infected, perhaps knowing that an antibody treatment is available might be a preferred option.
They(experts) have said several times now, the ‘vaccine’ doesn’t stop you from getting the virus. It wasn’t designed to work that way.
Experts say people can still spread and even develop COVID-19 after getting a vaccine. They note the immunity from the vaccine doesn’t begin to emerge until at least 12 days after inoculation. They add the vaccine doesn’t prevent coronavirus infection. It helps protect against serious illnesses.Jan 19, 2021
https://www.healthline.com/health-news/you-can-still-spread-develop-covid-19-after-getting-a-vaccine-what-to-know#:~:text=Experts%20say%20people%20can%20still,helps%20protect%20against%20serious%20illnesses.