Is it possible to get a negative pregnancy test at the doctors but still be pregnant a few days later?

So about 2 days ago i went to my gynecologist and they took a pregnancy test and said it was negative. Well my period is days away according to this app. I honestly feel like its not even going to come cuz it usually comes either a week earlier or a few days early, it never really waits until the exact day of my period so i find this odd. Im still going to wait of course if it comes but is it possible for me to be pregnant even tho my gynecologist said her test came back negative.

Btw! They only took a pee test not a blood test like i thought they would.

I go back in 2 weeks tho.

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