To find out what to do if you think you have symptoms, please visit Coronavirus symptom checker. Or visit our encyclopaedia page, which has general information and includes a BSL video.
NOTE: For general information about COVID-19 visit Welsh Government. For information on the vaccine and its rollout visit Public Health Wales.
Some women's cycles are not exactly 28 days. If your cycle is shorter or longer than 28 days, please adjust the number below.