Can I still be denied a mortgage even after I have been pre-approved?

I have been pre-approved based on the fact that in the past month I was given a raise from 45,000 to 65,000. The mortgage I am looking for is based on the 65,000 mortgage. So I haven’t been making that for very long though. I have awesome credit score of 741 and have never ever had a past due payment on anything. But I only have about 2,000 in the bank AND I work for my dad…which happens to be from home. Is this going to be a problem? I’m so scared I’m going to denied the mortgage. I’m sick to my stomach about it!
Can someone help me and give me some advise?

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