They are now saying it's ok to take one does of one vaccine and the second of another kek
>Researchers are aiming to inoculate more than 800 volunteers with one shot of the Pfizer-BioNTech vaccine,
>followed either four or 12 weeks later with a booster shot of the vaccine developed jointly by AstraZeneca and Oxford University, or vice versa.
https://www.voanews.com/covid-19-pandemic/uk-examines-whether-different-covid-19-vaccines-can-be-used-2-shot-regimen