Don’t worry @justyy, you can take AZ vaccine that has no side effects, I am also under 40 years and taken this vaccine one month ago because I was in priority list, from Surrey (in UK) , I had not any side affect just had high temperature for one day. But My other relatives had taken this vaccine, they had not any fever, fever depends on bodies immune ystem . Now waiting for second dose that is next month.
Very nice to hear that your whole family tested negative, best wishes for you.