The updated JCVI guidance on vaccinating pregnant women can be found by clicking on the following link 

If you're pregnant, or think you might be, you can have the COVID-9 vaccine. You'll be invited when your age group are offered it or earlier if you have a health condition or reason that means you're eligible.

It's preferable for you to have the Pfizer/BioNTech or Moderna vaccine. This is because they've been more widely used during pregnancy in other countries and have not caused any safety issues.