Started at a new job, but I’m still interviewing for a job I want more...what to do without putting a stain on my resume?

So as the title says, I just started a new job (Company A). But, I have another interview with a company I’d probably prefer bc I’ve heard they have better benefits, etc. (Company B) next week. Long story short, this new job at Company A was the only offer I had before (after x months of unemployment) , and Company B contacted me after I accepted Company A’s offer, so I felt compelled to accept a job at Company A at the time. Do I tell company B in the next interview that I started working at company A and say something like “I just would prefer remote work bc of the pandemic and am worried for my safety at company A” etc. (which is actually true) or do I act like I’m still looking and don’t have a job? I feel like I shouldn’t lie, but I don’t want them to back off. Plus, if company B does offer me a job, how do I tell company A? I don’t want them to be so mad they give me a negative reference for background checks in the future...though I’d leave them off my resume most likely.

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