No call today

I went for my morning ultra sound and blood, then stayed by the phone for new instructions.  Pass 5 pm, No call, I thought oh wow, is this normal for the weekend or am I forgotten?? Pass 530 I star to panic and dialed the emergency line, 15 minutes later the on call service gave me my new dosage for tonight. Maybe they are getting back at me for changing our plans? No conspiracy theory intended but this is pretty upsetting..:/