As mentioned it's most likely more tests, especially in Västra Götaland where almost half of the new cases came from yesterday. The hospital metrics such as patients in the hospital and patients in intensive care are slowly going down, in that region as well. You can see that in the first graph here. https://www.vgregion.se/covid-19-corona/statistik-covid-19-i...

Probably just more people getting tested, finally.

I wouldn't worry too much about it.