I hate how the doctor's office will say "we will only call if the results come back positive." So…

I hate how the doctor's office will say "we will only call if the results come back positive." So now I sit here for days praying they don't call and then eventually start to wonder if it has been long enough. Seriously, why can't they just call and say, " no, your blood hasn't formed antibodies that will attack the baby." That way I can just quit worrying that they might call with bad news.