urine test?

So awhile ago I went to the doctor to get prescribed birth control. They told me they couldn't prescribe it if I was pregnant so they had me do a urine test, which I didn't pee very much for, I had just went before my appointment. 
They ended up prescribing me the birth control and I'm on my first pack. 
If there was not enough urine or a positive result would they have told me? I'm assuming it was negative and enough since they put me on bc but I can't help but worry.

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