https://www.nhsinform.scot/covid-19-vaccine/the-vaccines/side-effects-of-the-coronavirus-vaccines
"Fever after the coronavirus vaccine
It’s quite common to develop a fever after a vaccination. This normally happens within 48 hours of the vaccination and usually goes away within 48 hours.
You do not need to self-isolate or book a test unless you have other coronavirus symptoms or:
you have been told by NHS Test and Protect, or your occupational health team, that you are a close contact of someone who has tested positive for coronavirus
you live with someone who has recently tested positive for coronavirus
you live with someone who has symptoms of coronavirus
If the fever starts more than 48 hours after the vaccination or lasts longer than 48 hours, you should self-isolate and book a test.
Side effects of the Pfizer/BioNTech vaccine
A full list of common side effects of the Pfizer/BioNTech vaccine is available on GOV.UK.
Information for UK recipients on Pfizer/BioNTech COVID-19 vaccine
Side effects of the AstraZeneca vaccine
A full list of common side effects of the AstraZeneca vaccine is available on GOV.UK.
Information for UK recipients on AstraZeneca COVID-19 vaccine