Scheduled tests vs random?

So today I called to see if I had to drug test as I do every weekday and I was told I’m now on scheduled drug tests and will just receive a text when I have to test. From what I thinking it’s literally still just random testing I just don’t have to call anymore? Tomorrow marks 6 months I’ve been on probation so idk if it’s a part of moving up or what. Does anyone have experience with this?I searched the sub and didn’t find anything. Thanks