You must self-isolate at home in line with the UK Government self-isolation guidance: https://gov.wales/self-isolation-stay-home-guidance-households-possible-coronavirus
To reduce the risk of passing on the infection to other household members you should take actions as outlined in the guidance.
Please refer to the ‘Ending Isolation’ guidance and for more information on when it is safe for you to come out of isolation:
Your household members must self-isolate for 10 days from your symptom onset date; if they subsequently develop symptoms themselves, they must self-isolate for at least 10 days from their symptom onset and may request a test.
If the ill person in the household is not showing any signs of improvement and has not already sought medical advice, visit the NHS Direct Wales website or call NHS 111. If it is a medical emergency, call 999.