Blank Pregnancy Test from OB/GYN

So from what I’m gathering my OB/GYN was going to let me run around after a false negative on a pregnancy test. (I’m 21 and drink, if this went on and I just trusted my medical professionals like most, this could have been devastating)

They sent me home with a test, I took it in the morning, and nothing. No control line, no positive line. (Isn’t this a false negative, or in-accurate? Because there is no control line meaning it isn’t working properly)

I called to ask what to do? And the MA was like mmmmk I’ll tell your doctor you aren’t pregnant....