Have braces, 4 premolars getting removed, please tell me my options

When I came in with messy teeth my dentist said I should get 4 premolars removed. She did not do an x ray. The thing is now that I looked online people are saying the arch should be expanded instead. And now that I see it, my arch is a bit narrow and my bite isn't aligned (a bit of overbite). The problem is, I already got ONE premolar removed (she said we can remove one at a time) from bottom teeth row. Am I forced to go through with the other 3 now? What are my options? Please help. Thank you

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