I'm starting to worry a bit because even after 25 days of taking the prescribed medication for COVID-19 and sticking to all the protocols, a positive test result is still showing up. There aren't any symptoms at the moment, but my dad's SpO2 levels are all over the place. They dip to around 93 in the evening but shoot back up to a normal 98 when he wakes up in the morning. Should I be concerned about this fluctuation? Is this considered normal?