I'm 34 weeks pregnant and in group 6 due to coeliac disease. I initially wasn't going to have the vaccination until after baby is born but now they've changed the advice for pregnant women I'm thinking of having it. However the advice says pregnant women should be offered an alternative to AZ, how do you know if there will be pfizer/moderna available? Do you just have to book it and turn up hoping for the best? Is it better to book through GP rather than the website?