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If you have a copy of I-140 or I-140 receipt notice, you can find out in what category your lawyer filed your petition.
In I-140, look at Part 2 (Petition type). If a, b or c is selected, you are in EB1; if d is selected, you are in EB2; otherwise, you are in EB3.
In receipt notice, look at the right box in the third row. If the section number is 203(b)(1)(A) through (C), you are in EB1; if it's 203(b)(2), you are in EB2; otherwise, you are in EB3.