This will be questioned at the I-140 stage, and I think you might have trouble meeting the "five years of progressively more responsible experience" requirement to get into the EB-2 category with a Bachelor's degree.
You would need to submit letters with the I-140 from your previous employers documenting your progressively more responsible work experience in the field. Aside from your experience being in a different field, I'm not clear that all of it was truly progressively more responsible (at least up until the last position).
Plus, your employer would need to document that a Master's/Bachelor's plus five years of progressively more responsible work experience was truly the minimum requirement for the job.
Speak with a lawyer for further guidance.
The regulations require a U.S. bachelor's degree (or foreign degree equivalent) plus five years of progressive, post-degree work experience. The five years of experience must be progressively more responsible and the USCIS may require an affidavit or statement under penalty of perjury that such progressive experience is required for the job. The "employment experience" must reveal progress, movement forward and advances toward increasingly complex or responsible duties, demonstrating advancing levels of experience and knowledge in the specialty.
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David N. Soloway
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