Pap smear

I went for my yearly pap last week . My doctors nurse called me today and said I have to come back in because my lab testing came back saying I have abnormal cells ! What does this mean ? She didn’t get much into detail but she said it’s nothing to worry about . So she told me come in on the 22nd of March . I’m guessing it’s not that bad ? If it was i guess they would Want me back there within a week or less ?