Yr wythnos diwethaf, amlinellodd y Prif Weinidog amserlen fanwl ar gyfer symud Cymru'n bendant i lefel rhybudd 3. Ond bellach bydd rhai o'r mesurau hyn yn cael eu cyflwyno'n gynt na'r disgwyl gan fod yr achosion wedi gostwng yn sylweddol, o 37 achos ym mhob 100,000 o bobl i lai na 21 ym mhob 100,000 yr wythnos hon.
The First Minister last week set out a detailed timetable for moving Wales firmly in to alert level three. But some of these measures will now be introduced sooner than planned as cases have fallen markedly from 37 cases per 100,000 people to fewer than 21 per 100,000 this week.