Is A Slight Increase In Direct Bilirubin Serious, And Could It Be Caused By Taking Non-whey Whole Food Protein Powder For A Few Days?

I took a liver function test today and my direct bilirubin results were 0.3mg /dl which is a bit higher than range and I had just started taking protein powder without any Whey protein it s just whole food proteins and I took it for 3 days before people told me to go get my liver tested first and researching this problem led me to studies claiming it was Whey protein powder so I want to get an answer from a professional before I go check up with my doctor. Is this serious and is protein the actual cause of it and what are the treatments